<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:96186969-4f90-4e1e-9447-59f3290c3b80,g:7036d0b3-a574-4fd3-b3bc-a2673f13baba-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/CoverPage" xlink:type="simple" xlink:href="ame-20200630.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/CoverPage" xlink:type="extended" id="i70858fb86f76434d899b1c46a8fba59c_CoverPage"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedStatementofIncome" xlink:type="simple" xlink:href="ame-20200630.xsd#ConsolidatedStatementofIncome"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedStatementofIncome" xlink:type="extended" id="i93dcd91be5904df382446a9b8255ef4d_ConsolidatedStatementofIncome"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedStatementofComprehensiveIncome" xlink:type="simple" xlink:href="ame-20200630.xsd#ConsolidatedStatementofComprehensiveIncome"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedStatementofComprehensiveIncome" xlink:type="extended" id="i4844152e3f1a428fb906a60e78cf91e8_ConsolidatedStatementofComprehensiveIncome"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedBalanceSheet" xlink:type="simple" xlink:href="ame-20200630.xsd#ConsolidatedBalanceSheet"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedBalanceSheet" xlink:type="extended" id="i6ed7d64ccf6d4b8083f1640fa9ce31e9_ConsolidatedBalanceSheet"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedStatementofStockholdersEquity" xlink:type="simple" xlink:href="ame-20200630.xsd#ConsolidatedStatementofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedStatementofStockholdersEquity" xlink:type="extended" id="i487d4fa0b7b44ffea4e9919c1b91da96_ConsolidatedStatementofStockholdersEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_5d32fd95-19d3-4305-bf37-027022a2a225" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdateExtensibleList_03462253-906c-4967-b0b0-c9a83766e2fb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingStandardsUpdateExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5d32fd95-19d3-4305-bf37-027022a2a225" xlink:to="loc_us-gaap_AccountingStandardsUpdateExtensibleList_03462253-906c-4967-b0b0-c9a83766e2fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5d32fd95-19d3-4305-bf37-027022a2a225" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_14d46c99-37c3-40fc-80d5-20b6108dca1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_StockholdersEquity_14d46c99-37c3-40fc-80d5-20b6108dca1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_3ec2f335-53c9-47e4-b88b-3d48217f989c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_3ec2f335-53c9-47e4-b88b-3d48217f989c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_d9938c33-3a38-4ce7-b231-f11e9fc7653b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_d9938c33-3a38-4ce7-b231-f11e9fc7653b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_18d0e59f-1f61-4e9c-abd7-721acb6bd64f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_18d0e59f-1f61-4e9c-abd7-721acb6bd64f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_07c25bcd-bfeb-4b68-a253-e011e90a668e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_NetIncomeLoss_07c25bcd-bfeb-4b68-a253-e011e90a668e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_4ffe4c85-22b2-4142-a6c1-5fd6ad8a93b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_DividendsCommonStockCash_4ffe4c85-22b2-4142-a6c1-5fd6ad8a93b7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_b4c94d7c-c748-4722-9a0e-9d19566b7f8e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_StockholdersEquityOther_b4c94d7c-c748-4722-9a0e-9d19566b7f8e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_af91a1e5-5180-4267-85a0-62eec36d0e61" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_af91a1e5-5180-4267-85a0-62eec36d0e61" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_1464efba-3578-4a0d-a881-c0e6a5a2ce66" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_1464efba-3578-4a0d-a881-c0e6a5a2ce66" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax_9ee50eed-6588-4cf9-8248-dfb200efcd82" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax_9ee50eed-6588-4cf9-8248-dfb200efcd82" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_a36656ae-523a-4f02-8fc2-14b9911d334e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_a36656ae-523a-4f02-8fc2-14b9911d334e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_8df667b2-f8fd-4c7d-b930-0cafb62b7bca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1ad933e7-0a75-4827-b265-98c593ceea27" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_8df667b2-f8fd-4c7d-b930-0cafb62b7bca" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_62ab6e2d-6b4c-4c8f-8f07-e19d035dcce2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_1a5c7839-b698-4b19-a80b-5dca567df393" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_5d32fd95-19d3-4305-bf37-027022a2a225" xlink:to="loc_us-gaap_StatementTable_1a5c7839-b698-4b19-a80b-5dca567df393" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_d9e10571-7f1b-4092-868e-3d23f2c2a8a2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1a5c7839-b698-4b19-a80b-5dca567df393" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_d9e10571-7f1b-4092-868e-3d23f2c2a8a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d9e10571-7f1b-4092-868e-3d23f2c2a8a2_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_d9e10571-7f1b-4092-868e-3d23f2c2a8a2" xlink:to="loc_us-gaap_EquityComponentDomain_d9e10571-7f1b-4092-868e-3d23f2c2a8a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_d9e10571-7f1b-4092-868e-3d23f2c2a8a2" xlink:to="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_a99fd4f0-4fb0-4428-b66e-51a3ee143bc5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:to="loc_us-gaap_CommonStockMember_a99fd4f0-4fb0-4428-b66e-51a3ee143bc5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_95129bfb-9c3d-4c3d-a146-dc48f213acb4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_95129bfb-9c3d-4c3d-a146-dc48f213acb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_838fa2c9-8650-468c-a994-c2292b18fa64" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:to="loc_us-gaap_RetainedEarningsMember_838fa2c9-8650-468c-a994-c2292b18fa64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_26fd8259-1daa-40c2-84ed-dcd629b22a50" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_26fd8259-1daa-40c2-84ed-dcd629b22a50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_e8bdad31-18aa-4cbb-8722-001e2e3b2f11" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_e8bdad31-18aa-4cbb-8722-001e2e3b2f11" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_0c13f682-ad80-4683-8c5e-4ad01973ce53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_0c13f682-ad80-4683-8c5e-4ad01973ce53" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_b0b884f6-3adf-45d7-9b71-47869c509e70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3b6b9f8c-505a-42a4-a0d4-e3432027d5da" xlink:to="loc_us-gaap_TreasuryStockMember_b0b884f6-3adf-45d7-9b71-47869c509e70" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_2946081c-9f75-4df5-b9c4-e1a3a7a406c5" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1a5c7839-b698-4b19-a80b-5dca567df393" xlink:to="loc_srt_RestatementAxis_2946081c-9f75-4df5-b9c4-e1a3a7a406c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_2946081c-9f75-4df5-b9c4-e1a3a7a406c5_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_2946081c-9f75-4df5-b9c4-e1a3a7a406c5" xlink:to="loc_srt_RestatementDomain_2946081c-9f75-4df5-b9c4-e1a3a7a406c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_2fec1c38-b4b6-4623-a45b-7456df93e9fa" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_2946081c-9f75-4df5-b9c4-e1a3a7a406c5" xlink:to="loc_srt_RestatementDomain_2fec1c38-b4b6-4623-a45b-7456df93e9fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember_c2d1997c-525f-4fa1-9848-d94afdcebd5c" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_2fec1c38-b4b6-4623-a45b-7456df93e9fa" xlink:to="loc_srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember_c2d1997c-525f-4fa1-9848-d94afdcebd5c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedStatementofStockholdersEquityParenthetical" xlink:type="simple" xlink:href="ame-20200630.xsd#ConsolidatedStatementofStockholdersEquityParenthetical"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedStatementofStockholdersEquityParenthetical" xlink:type="extended" id="i3fc49f0b52414becbff6ddf10feec286_ConsolidatedStatementofStockholdersEquityParenthetical"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/CondensedConsolidatedStatementofCashFlows" xlink:type="simple" xlink:href="ame-20200630.xsd#CondensedConsolidatedStatementofCashFlows"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/CondensedConsolidatedStatementofCashFlows" xlink:type="extended" id="ife109f957c474321a79f16b419121e86_CondensedConsolidatedStatementofCashFlows"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/BasisofPresentation" xlink:type="simple" xlink:href="ame-20200630.xsd#BasisofPresentation"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/BasisofPresentation" xlink:type="extended" id="i56e67657c90a4106bb286865269b3ac7_BasisofPresentation"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RecentAccountingPronouncements" xlink:type="simple" xlink:href="ame-20200630.xsd#RecentAccountingPronouncements"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RecentAccountingPronouncements" xlink:type="extended" id="ief3744415fa541b78440653d4cd54402_RecentAccountingPronouncements"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AccountingChangesandErrorCorrectionsPolicies" xlink:type="simple" xlink:href="ame-20200630.xsd#AccountingChangesandErrorCorrectionsPolicies"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AccountingChangesandErrorCorrectionsPolicies" xlink:type="extended" id="if250048361be4bf48fa527813712af7f_AccountingChangesandErrorCorrectionsPolicies"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RecentAccountingPronouncementsAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RecentAccountingPronouncementsAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RecentAccountingPronouncementsAdditionalInformationDetail" xlink:type="extended" id="i4739f8523352414aa84d543ce1c0d61e_RecentAccountingPronouncementsAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_9f6e5290-771b-4eae-bb00-a35d92e07b49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_b1a5b437-6aca-44b1-9bde-28e74ac2e19c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_9f6e5290-771b-4eae-bb00-a35d92e07b49" xlink:to="loc_us-gaap_ReceivablesNetCurrent_b1a5b437-6aca-44b1-9bde-28e74ac2e19c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_fdbee183-40b0-4523-a24f-a43eafb768b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_9f6e5290-771b-4eae-bb00-a35d92e07b49" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_fdbee183-40b0-4523-a24f-a43eafb768b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_49709b8c-0d9e-433c-8dc5-54c366a899b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_9f6e5290-771b-4eae-bb00-a35d92e07b49" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_49709b8c-0d9e-433c-8dc5-54c366a899b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_f897b6aa-6260-4335-a4fb-1318129004ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_49709b8c-0d9e-433c-8dc5-54c366a899b4" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_f897b6aa-6260-4335-a4fb-1318129004ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_f897b6aa-6260-4335-a4fb-1318129004ab_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_f897b6aa-6260-4335-a4fb-1318129004ab" xlink:to="loc_us-gaap_TypeOfAdoptionMember_f897b6aa-6260-4335-a4fb-1318129004ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_878a973e-7edd-4486-bf5f-62058ec1ff5e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_f897b6aa-6260-4335-a4fb-1318129004ab" xlink:to="loc_us-gaap_TypeOfAdoptionMember_878a973e-7edd-4486-bf5f-62058ec1ff5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate201613Member_e3ce96cc-7be5-46f6-a578-ec1ff361fccf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingStandardsUpdate201613Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_878a973e-7edd-4486-bf5f-62058ec1ff5e" xlink:to="loc_us-gaap_AccountingStandardsUpdate201613Member_e3ce96cc-7be5-46f6-a578-ec1ff361fccf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_fada9aaa-8103-493d-b192-177a80220810" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_49709b8c-0d9e-433c-8dc5-54c366a899b4" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_fada9aaa-8103-493d-b192-177a80220810" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_fada9aaa-8103-493d-b192-177a80220810_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_fada9aaa-8103-493d-b192-177a80220810" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_fada9aaa-8103-493d-b192-177a80220810_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f6b01462-9e1b-4643-80fb-b96cdd24f307" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_fada9aaa-8103-493d-b192-177a80220810" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f6b01462-9e1b-4643-80fb-b96cdd24f307" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_078286e4-07e0-496c-9b8c-531ddf996eec" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f6b01462-9e1b-4643-80fb-b96cdd24f307" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_078286e4-07e0-496c-9b8c-531ddf996eec" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Revenues" xlink:type="simple" xlink:href="ame-20200630.xsd#Revenues"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Revenues" xlink:type="extended" id="i3944968328644759807cfc2b95e5e6b1_Revenues"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesTables" xlink:type="simple" xlink:href="ame-20200630.xsd#RevenuesTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesTables" xlink:type="extended" id="i1c441a2223814988880d38d60fbc53d8_RevenuesTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesOutstandingContractAssetandLiabilityAccountsDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RevenuesOutstandingContractAssetandLiabilityAccountsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesOutstandingContractAssetandLiabilityAccountsDetail" xlink:type="extended" id="i4334f35356bc4a758b022c4c91ee820d_RevenuesOutstandingContractAssetandLiabilityAccountsDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RevenuesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesAdditionalInformationDetail" xlink:type="extended" id="ie223201eda7645299a1d92d504c6d12f_RevenuesAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_7e689ca5-3807-46c7-8d7f-82e062df0a3e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_7e689ca5-3807-46c7-8d7f-82e062df0a3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_7b2747a3-ed26-4d5d-bed7-2c3cddf2c935" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_7b2747a3-ed26-4d5d-bed7-2c3cddf2c935" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_938159f2-5c54-4f53-9774-5a68db1a97ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_938159f2-5c54-4f53-9774-5a68db1a97ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_17b05035-4e22-4f70-8a52-6117830d49c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_17b05035-4e22-4f70-8a52-6117830d49c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandardProductWarrantyDescription_b3b33cd3-8f3e-4334-a8e5-9c58572c5285" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StandardProductWarrantyDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_StandardProductWarrantyDescription_b3b33cd3-8f3e-4334-a8e5-9c58572c5285" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_4b79f063-99b8-4775-887d-63b29ed5eac7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_ReceivablesNetCurrent_4b79f063-99b8-4775-887d-63b29ed5eac7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForNotesAndLoansReceivableCurrent_ff2abf23-221a-4916-b826-21f1ad265a56" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForNotesAndLoansReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_AllowanceForNotesAndLoansReceivableCurrent_ff2abf23-221a-4916-b826-21f1ad265a56" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_d9a66a30-0913-4a99-b428-48e29fa11420" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_d9a66a30-0913-4a99-b428-48e29fa11420" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_d9a66a30-0913-4a99-b428-48e29fa11420_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_d9a66a30-0913-4a99-b428-48e29fa11420" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_d9a66a30-0913-4a99-b428-48e29fa11420_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_80255313-52bb-42e0-aa40-806a6adf86c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_d9a66a30-0913-4a99-b428-48e29fa11420" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_80255313-52bb-42e0-aa40-806a6adf86c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_803d8a11-f5c4-456e-acdc-148440f921ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_80255313-52bb-42e0-aa40-806a6adf86c1" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_803d8a11-f5c4-456e-acdc-148440f921ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_4c0d795d-1685-423a-8725-1c7a59828e54" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:to="loc_srt_RangeAxis_4c0d795d-1685-423a-8725-1c7a59828e54" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4c0d795d-1685-423a-8725-1c7a59828e54_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_4c0d795d-1685-423a-8725-1c7a59828e54" xlink:to="loc_srt_RangeMember_4c0d795d-1685-423a-8725-1c7a59828e54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_27df2073-7549-404b-b231-ceb51de5c55d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_4c0d795d-1685-423a-8725-1c7a59828e54" xlink:to="loc_srt_RangeMember_27df2073-7549-404b-b231-ceb51de5c55d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_64db0bf1-db98-4136-8e9c-f8edddf161a1" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_27df2073-7549-404b-b231-ceb51de5c55d" xlink:to="loc_srt_MinimumMember_64db0bf1-db98-4136-8e9c-f8edddf161a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b0fab766-4ce6-49cc-b488-7617ea1b4de7" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_27df2073-7549-404b-b231-ceb51de5c55d" xlink:to="loc_srt_MaximumMember_b0fab766-4ce6-49cc-b488-7617ea1b4de7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_200dfbcc-102d-433a-8fb8-d175b9b603ac" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_200dfbcc-102d-433a-8fb8-d175b9b603ac" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesAdditionalInformationDetail_1" xlink:type="simple" xlink:href="ame-20200630.xsd#RevenuesAdditionalInformationDetail_1"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesAdditionalInformationDetail_1" xlink:type="extended" id="i2321241878914aa7b293391b6905f993_RevenuesAdditionalInformationDetail_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_7e689ca5-3807-46c7-8d7f-82e062df0a3e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_7e689ca5-3807-46c7-8d7f-82e062df0a3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_7b2747a3-ed26-4d5d-bed7-2c3cddf2c935" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_7b2747a3-ed26-4d5d-bed7-2c3cddf2c935" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_938159f2-5c54-4f53-9774-5a68db1a97ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_938159f2-5c54-4f53-9774-5a68db1a97ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_17b05035-4e22-4f70-8a52-6117830d49c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_17b05035-4e22-4f70-8a52-6117830d49c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandardProductWarrantyDescription_b3b33cd3-8f3e-4334-a8e5-9c58572c5285" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StandardProductWarrantyDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_StandardProductWarrantyDescription_b3b33cd3-8f3e-4334-a8e5-9c58572c5285" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_4b79f063-99b8-4775-887d-63b29ed5eac7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_ReceivablesNetCurrent_4b79f063-99b8-4775-887d-63b29ed5eac7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForNotesAndLoansReceivableCurrent_ff2abf23-221a-4916-b826-21f1ad265a56" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForNotesAndLoansReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_AllowanceForNotesAndLoansReceivableCurrent_ff2abf23-221a-4916-b826-21f1ad265a56" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_16702fbe-c16f-4f33-9b3c-cbf24ce0c421" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_d9a66a30-0913-4a99-b428-48e29fa11420" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_d9a66a30-0913-4a99-b428-48e29fa11420" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_d9a66a30-0913-4a99-b428-48e29fa11420_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_d9a66a30-0913-4a99-b428-48e29fa11420" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_d9a66a30-0913-4a99-b428-48e29fa11420_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_80255313-52bb-42e0-aa40-806a6adf86c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_d9a66a30-0913-4a99-b428-48e29fa11420" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_80255313-52bb-42e0-aa40-806a6adf86c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_803d8a11-f5c4-456e-acdc-148440f921ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_80255313-52bb-42e0-aa40-806a6adf86c1" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_803d8a11-f5c4-456e-acdc-148440f921ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_4c0d795d-1685-423a-8725-1c7a59828e54" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_127f0ffa-5013-4b97-9432-61afa06cf573" xlink:to="loc_srt_RangeAxis_4c0d795d-1685-423a-8725-1c7a59828e54" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4c0d795d-1685-423a-8725-1c7a59828e54_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_4c0d795d-1685-423a-8725-1c7a59828e54" xlink:to="loc_srt_RangeMember_4c0d795d-1685-423a-8725-1c7a59828e54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_27df2073-7549-404b-b231-ceb51de5c55d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_4c0d795d-1685-423a-8725-1c7a59828e54" xlink:to="loc_srt_RangeMember_27df2073-7549-404b-b231-ceb51de5c55d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_64db0bf1-db98-4136-8e9c-f8edddf161a1" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_27df2073-7549-404b-b231-ceb51de5c55d" xlink:to="loc_srt_MinimumMember_64db0bf1-db98-4136-8e9c-f8edddf161a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b0fab766-4ce6-49cc-b488-7617ea1b4de7" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_27df2073-7549-404b-b231-ceb51de5c55d" xlink:to="loc_srt_MaximumMember_b0fab766-4ce6-49cc-b488-7617ea1b4de7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesInformationaboutOperationsinDifferentGeographicAreasDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RevenuesInformationaboutOperationsinDifferentGeographicAreasDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesInformationaboutOperationsinDifferentGeographicAreasDetail" xlink:type="extended" id="idb4590abde014d54b205000e085806ba_RevenuesInformationaboutOperationsinDifferentGeographicAreasDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_2a024245-6f82-44bb-a084-c380e95dcedb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_c3a7dea4-116e-4355-8af0-667357e3897f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2a024245-6f82-44bb-a084-c380e95dcedb" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_c3a7dea4-116e-4355-8af0-667357e3897f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d0abcbaa-498c-4c8b-be8d-4193d3bf2e94" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2a024245-6f82-44bb-a084-c380e95dcedb" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d0abcbaa-498c-4c8b-be8d-4193d3bf2e94" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_eebae629-7f95-4409-972a-b04b84024cbf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d0abcbaa-498c-4c8b-be8d-4193d3bf2e94" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_eebae629-7f95-4409-972a-b04b84024cbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_eebae629-7f95-4409-972a-b04b84024cbf_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_eebae629-7f95-4409-972a-b04b84024cbf" xlink:to="loc_us-gaap_SegmentDomain_eebae629-7f95-4409-972a-b04b84024cbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_17875d25-8d68-4ece-b646-eda7fc99f7be" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_eebae629-7f95-4409-972a-b04b84024cbf" xlink:to="loc_us-gaap_SegmentDomain_17875d25-8d68-4ece-b646-eda7fc99f7be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_a48593b6-6c6e-4544-ad1f-b3c3fdacfed4" xlink:href="ame-20200630.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_17875d25-8d68-4ece-b646-eda7fc99f7be" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_a48593b6-6c6e-4544-ad1f-b3c3fdacfed4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_ca39238f-4ae6-40ce-94cf-efc5c9f633ae" xlink:href="ame-20200630.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_17875d25-8d68-4ece-b646-eda7fc99f7be" xlink:to="loc_ame_ElectromechanicalGroupMember_ca39238f-4ae6-40ce-94cf-efc5c9f633ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_664cc02c-0994-4996-9c83-04df4a75f2ea" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d0abcbaa-498c-4c8b-be8d-4193d3bf2e94" xlink:to="loc_srt_StatementGeographicalAxis_664cc02c-0994-4996-9c83-04df4a75f2ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_664cc02c-0994-4996-9c83-04df4a75f2ea_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_664cc02c-0994-4996-9c83-04df4a75f2ea" xlink:to="loc_srt_SegmentGeographicalDomain_664cc02c-0994-4996-9c83-04df4a75f2ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_664cc02c-0994-4996-9c83-04df4a75f2ea" xlink:to="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_4c5c2d95-f5d9-48c8-b1b3-6688aca31979" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:to="loc_country_US_4c5c2d95-f5d9-48c8-b1b3-6688aca31979" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_c05bd2e0-5f55-48c1-be62-b7ac9f7965be" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:to="loc_country_GB_c05bd2e0-5f55-48c1-be62-b7ac9f7965be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EuropeanUnionMember_2596da78-69b7-40ef-b5bc-7698f532f6f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EuropeanUnionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:to="loc_us-gaap_EuropeanUnionMember_2596da78-69b7-40ef-b5bc-7698f532f6f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_820dea3f-c3cf-4ccc-bde8-3c8aaa007a8a" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_AsiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:to="loc_srt_AsiaMember_820dea3f-c3cf-4ccc-bde8-3c8aaa007a8a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_OtherForeignCountriesMember_08915e86-da95-4a29-b54e-7059ac0eb3be" xlink:href="ame-20200630.xsd#ame_OtherForeignCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:to="loc_ame_OtherForeignCountriesMember_08915e86-da95-4a29-b54e-7059ac0eb3be" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_InternationalMember_e73fc705-5b4d-4801-853c-f36c4af4f1a4" xlink:href="ame-20200630.xsd#ame_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:to="loc_ame_InternationalMember_e73fc705-5b4d-4801-853c-f36c4af4f1a4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_55c1b06d-3c9c-4a55-a1a2-7c73829f05cd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5c64c268-874e-4466-a416-962e058b96ef" xlink:to="loc_us-gaap_NonUsMember_55c1b06d-3c9c-4a55-a1a2-7c73829f05cd" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesMajorProductsandServicesinReportableSegmentsDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RevenuesMajorProductsandServicesinReportableSegmentsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesMajorProductsandServicesinReportableSegmentsDetail" xlink:type="extended" id="ide8e4d5ec17c4cb1ba84b1a36194d24f_RevenuesMajorProductsandServicesinReportableSegmentsDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_1de84468-586c-4c60-be9f-607517ba6b5b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_fa75305c-70ff-4fc9-8159-f9f431cbf65e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_1de84468-586c-4c60-be9f-607517ba6b5b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_fa75305c-70ff-4fc9-8159-f9f431cbf65e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_d6942ae1-3b98-40e1-8116-e781195dd9e2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_1de84468-586c-4c60-be9f-607517ba6b5b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_d6942ae1-3b98-40e1-8116-e781195dd9e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_897d84f3-8f2e-4744-bd04-b6df5b5c2521" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_d6942ae1-3b98-40e1-8116-e781195dd9e2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_897d84f3-8f2e-4744-bd04-b6df5b5c2521" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_897d84f3-8f2e-4744-bd04-b6df5b5c2521_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_897d84f3-8f2e-4744-bd04-b6df5b5c2521" xlink:to="loc_us-gaap_SegmentDomain_897d84f3-8f2e-4744-bd04-b6df5b5c2521_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cadf2b40-9aae-457a-9484-78b5c556ce38" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_897d84f3-8f2e-4744-bd04-b6df5b5c2521" xlink:to="loc_us-gaap_SegmentDomain_cadf2b40-9aae-457a-9484-78b5c556ce38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_af62bf7f-8190-4552-a11a-a641af927aca" xlink:href="ame-20200630.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cadf2b40-9aae-457a-9484-78b5c556ce38" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_af62bf7f-8190-4552-a11a-a641af927aca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_eec95b08-86a9-493a-9f34-0421eaeb7837" xlink:href="ame-20200630.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cadf2b40-9aae-457a-9484-78b5c556ce38" xlink:to="loc_ame_ElectromechanicalGroupMember_eec95b08-86a9-493a-9f34-0421eaeb7837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_527acdf0-1e34-457d-9352-d4b55497984c" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_d6942ae1-3b98-40e1-8116-e781195dd9e2" xlink:to="loc_srt_ProductOrServiceAxis_527acdf0-1e34-457d-9352-d4b55497984c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_527acdf0-1e34-457d-9352-d4b55497984c_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_527acdf0-1e34-457d-9352-d4b55497984c" xlink:to="loc_srt_ProductsAndServicesDomain_527acdf0-1e34-457d-9352-d4b55497984c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b175d1bd-baed-4e5b-a65b-72746ecddd2f" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_527acdf0-1e34-457d-9352-d4b55497984c" xlink:to="loc_srt_ProductsAndServicesDomain_b175d1bd-baed-4e5b-a65b-72746ecddd2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ProcessAndAnalyticalInstrumentationMember_585e8eaa-e5e3-4dcb-998c-3406d320e121" xlink:href="ame-20200630.xsd#ame_ProcessAndAnalyticalInstrumentationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b175d1bd-baed-4e5b-a65b-72746ecddd2f" xlink:to="loc_ame_ProcessAndAnalyticalInstrumentationMember_585e8eaa-e5e3-4dcb-998c-3406d320e121" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_AerospaceAndPowerMember_cd9dd11d-52b0-4048-a100-e6ee5291287d" xlink:href="ame-20200630.xsd#ame_AerospaceAndPowerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b175d1bd-baed-4e5b-a65b-72746ecddd2f" xlink:to="loc_ame_AerospaceAndPowerMember_cd9dd11d-52b0-4048-a100-e6ee5291287d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_AutomationAndEngineeredSolutionsMember_d06c12f5-ef66-42f2-be44-60f92471c68b" xlink:href="ame-20200630.xsd#ame_AutomationAndEngineeredSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b175d1bd-baed-4e5b-a65b-72746ecddd2f" xlink:to="loc_ame_AutomationAndEngineeredSolutionsMember_d06c12f5-ef66-42f2-be44-60f92471c68b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesTimingofRevenueRecognitionDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RevenuesTimingofRevenueRecognitionDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesTimingofRevenueRecognitionDetail" xlink:type="extended" id="i6fe43f429bb545218c3a022907e206df_RevenuesTimingofRevenueRecognitionDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_b47db953-f569-41a1-945d-2a8c8afddeec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_82af3e5b-2626-437e-9660-f500c58af09d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_b47db953-f569-41a1-945d-2a8c8afddeec" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_82af3e5b-2626-437e-9660-f500c58af09d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_d5ccf279-4d27-497e-89bf-89f533762162" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_b47db953-f569-41a1-945d-2a8c8afddeec" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_d5ccf279-4d27-497e-89bf-89f533762162" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_78a46a6a-e6c7-462f-8df4-c8b4565f9ba7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_d5ccf279-4d27-497e-89bf-89f533762162" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_78a46a6a-e6c7-462f-8df4-c8b4565f9ba7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_78a46a6a-e6c7-462f-8df4-c8b4565f9ba7_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_78a46a6a-e6c7-462f-8df4-c8b4565f9ba7" xlink:to="loc_us-gaap_SegmentDomain_78a46a6a-e6c7-462f-8df4-c8b4565f9ba7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d1bf9f3d-4205-4244-b4c8-5ac85b22a163" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_78a46a6a-e6c7-462f-8df4-c8b4565f9ba7" xlink:to="loc_us-gaap_SegmentDomain_d1bf9f3d-4205-4244-b4c8-5ac85b22a163" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_ddb1b1b4-03e2-4d35-a967-38a209293453" xlink:href="ame-20200630.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d1bf9f3d-4205-4244-b4c8-5ac85b22a163" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_ddb1b1b4-03e2-4d35-a967-38a209293453" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_c6b997cb-e138-4b51-8a9c-d636eecf25b2" xlink:href="ame-20200630.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d1bf9f3d-4205-4244-b4c8-5ac85b22a163" xlink:to="loc_ame_ElectromechanicalGroupMember_c6b997cb-e138-4b51-8a9c-d636eecf25b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_39e22e2b-30b3-4cb7-84a1-9c51dc890a93" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_d5ccf279-4d27-497e-89bf-89f533762162" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_39e22e2b-30b3-4cb7-84a1-9c51dc890a93" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_39e22e2b-30b3-4cb7-84a1-9c51dc890a93_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_39e22e2b-30b3-4cb7-84a1-9c51dc890a93" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_39e22e2b-30b3-4cb7-84a1-9c51dc890a93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_c1da393a-3a0e-4d49-8f3b-e9c8df78a65c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_39e22e2b-30b3-4cb7-84a1-9c51dc890a93" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_c1da393a-3a0e-4d49-8f3b-e9c8df78a65c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_5b8c5faf-e813-460d-a35d-784351b58397" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_c1da393a-3a0e-4d49-8f3b-e9c8df78a65c" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_5b8c5faf-e813-460d-a35d-784351b58397" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_47c7639d-99dc-4e96-8e0b-d1755d31cfd0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_c1da393a-3a0e-4d49-8f3b-e9c8df78a65c" xlink:to="loc_us-gaap_TransferredOverTimeMember_47c7639d-99dc-4e96-8e0b-d1755d31cfd0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesChangesinAccruedProductWarrantyObligationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RevenuesChangesinAccruedProductWarrantyObligationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesChangesinAccruedProductWarrantyObligationDetail" xlink:type="extended" id="ia26f209f4a8444f48cc17576bb10f7c7_RevenuesChangesinAccruedProductWarrantyObligationDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/EarningsPerShare" xlink:type="simple" xlink:href="ame-20200630.xsd#EarningsPerShare"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/EarningsPerShare" xlink:type="extended" id="i2bef88ad91d346de8d2d176d172a6b61_EarningsPerShare"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/EarningsPerShareTables" xlink:type="simple" xlink:href="ame-20200630.xsd#EarningsPerShareTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/EarningsPerShareTables" xlink:type="extended" id="i09ff1d7c7bb547fb8595a1ad91d6d23a_EarningsPerShareTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/EarningsPerShareNumberofWeightedAverageSharesDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#EarningsPerShareNumberofWeightedAverageSharesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/EarningsPerShareNumberofWeightedAverageSharesDetail" xlink:type="extended" id="i682486c48bcc46088055d1742c73b8e2_EarningsPerShareNumberofWeightedAverageSharesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurements" xlink:type="simple" xlink:href="ame-20200630.xsd#FairValueMeasurements"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurements" xlink:type="extended" id="i152c8786c8ed456282ad2149d8344152_FairValueMeasurements"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="ame-20200630.xsd#FairValueMeasurementsTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurementsTables" xlink:type="extended" id="if255bb19d5854212a16122cb0d9eb018_FairValueMeasurementsTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurementsFairValueofAssetsMeasuredonRecurringBasisDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#FairValueMeasurementsFairValueofAssetsMeasuredonRecurringBasisDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurementsFairValueofAssetsMeasuredonRecurringBasisDetail" xlink:type="extended" id="i4c98531062eb43f4b10eca45b66f493e_FairValueMeasurementsFairValueofAssetsMeasuredonRecurringBasisDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_767b77c9-bed2-4618-b219-a90fda142737" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermInvestments_7f510556-ace0-43c9-84b2-f12246e74498" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_767b77c9-bed2-4618-b219-a90fda142737" xlink:to="loc_us-gaap_LongTermInvestments_7f510556-ace0-43c9-84b2-f12246e74498" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_80930cf5-9127-47dc-b090-2a078fa0e8ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_767b77c9-bed2-4618-b219-a90fda142737" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_80930cf5-9127-47dc-b090-2a078fa0e8ca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_75991088-02d8-4ad0-b003-aec1ad2f054d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_80930cf5-9127-47dc-b090-2a078fa0e8ca" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_75991088-02d8-4ad0-b003-aec1ad2f054d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_75991088-02d8-4ad0-b003-aec1ad2f054d_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_75991088-02d8-4ad0-b003-aec1ad2f054d" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_75991088-02d8-4ad0-b003-aec1ad2f054d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_433ab7eb-8b91-44a4-ac5d-c0cf279cfd2b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_75991088-02d8-4ad0-b003-aec1ad2f054d" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_433ab7eb-8b91-44a4-ac5d-c0cf279cfd2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_553a681a-25d9-4e61-bd28-f859812f0c53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_433ab7eb-8b91-44a4-ac5d-c0cf279cfd2b" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_553a681a-25d9-4e61-bd28-f859812f0c53" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurementsAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#FairValueMeasurementsAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurementsAdditionalInformationDetail" xlink:type="extended" id="i6dc0b2d058714a1894ac5d16c21c2bf7_FairValueMeasurementsAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_320677ce-26c8-4805-8090-3393c6d1f4c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_112a59b2-edb5-4133-bafa-55eeb0dd3c94" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_320677ce-26c8-4805-8090-3393c6d1f4c9" xlink:to="loc_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_112a59b2-edb5-4133-bafa-55eeb0dd3c94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_77423a83-ccc2-430f-9702-6e31b63032c7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_320677ce-26c8-4805-8090-3393c6d1f4c9" xlink:to="loc_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_77423a83-ccc2-430f-9702-6e31b63032c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_f8be8f93-ad27-475b-98a4-954420aeb99e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_320677ce-26c8-4805-8090-3393c6d1f4c9" xlink:to="loc_us-gaap_DerivativeNotionalAmount_f8be8f93-ad27-475b-98a4-954420aeb99e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_64076ed7-5a53-49e8-a702-8f6e6418fd0f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_320677ce-26c8-4805-8090-3393c6d1f4c9" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_64076ed7-5a53-49e8-a702-8f6e6418fd0f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_BritishPoundForwardContractNumberOfContracts_5d88473e-2dc5-472d-9ab4-9639e49220cd" xlink:href="ame-20200630.xsd#ame_BritishPoundForwardContractNumberOfContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_320677ce-26c8-4805-8090-3393c6d1f4c9" xlink:to="loc_ame_BritishPoundForwardContractNumberOfContracts_5d88473e-2dc5-472d-9ab4-9639e49220cd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_faa79c66-652c-4608-8692-850070a72553" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_320677ce-26c8-4805-8090-3393c6d1f4c9" xlink:to="loc_us-gaap_DerivativeTable_faa79c66-652c-4608-8692-850070a72553" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_1a77c72d-9a96-4e91-adcc-3f8db6294ee7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_faa79c66-652c-4608-8692-850070a72553" xlink:to="loc_us-gaap_FinancialInstrumentAxis_1a77c72d-9a96-4e91-adcc-3f8db6294ee7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a77c72d-9a96-4e91-adcc-3f8db6294ee7_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_1a77c72d-9a96-4e91-adcc-3f8db6294ee7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a77c72d-9a96-4e91-adcc-3f8db6294ee7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4c55d3f2-5569-40a1-ac82-608bc5731f88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_1a77c72d-9a96-4e91-adcc-3f8db6294ee7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4c55d3f2-5569-40a1-ac82-608bc5731f88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_35a24aba-985d-44cb-9af4-36d013838a2c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4c55d3f2-5569-40a1-ac82-608bc5731f88" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_35a24aba-985d-44cb-9af4-36d013838a2c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_79cfd898-fd46-4a33-9339-5879bcc984b5" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_faa79c66-652c-4608-8692-850070a72553" xlink:to="loc_srt_CurrencyAxis_79cfd898-fd46-4a33-9339-5879bcc984b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_79cfd898-fd46-4a33-9339-5879bcc984b5_default" xlink:href="https://xbrl.sec.gov/currency/2020/currency-2020-01-31.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_79cfd898-fd46-4a33-9339-5879bcc984b5" xlink:to="loc_currency_AllCurrenciesDomain_79cfd898-fd46-4a33-9339-5879bcc984b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_92a7896e-81ae-46bf-b1fd-49a34ddcc224" xlink:href="https://xbrl.sec.gov/currency/2020/currency-2020-01-31.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_79cfd898-fd46-4a33-9339-5879bcc984b5" xlink:to="loc_currency_AllCurrenciesDomain_92a7896e-81ae-46bf-b1fd-49a34ddcc224" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_CAD_376495da-bf94-4f98-865a-ace9c11efbe1" xlink:href="https://xbrl.sec.gov/currency/2020/currency-2020-01-31.xsd#currency_CAD"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_92a7896e-81ae-46bf-b1fd-49a34ddcc224" xlink:to="loc_currency_CAD_376495da-bf94-4f98-865a-ace9c11efbe1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_GBP_98f0fecc-8439-48cd-b8eb-2ee324e72fc0" xlink:href="https://xbrl.sec.gov/currency/2020/currency-2020-01-31.xsd#currency_GBP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_92a7896e-81ae-46bf-b1fd-49a34ddcc224" xlink:to="loc_currency_GBP_98f0fecc-8439-48cd-b8eb-2ee324e72fc0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurementsFairValueDisclosuresofFinancialInstrumentLiabilitiesDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#FairValueMeasurementsFairValueDisclosuresofFinancialInstrumentLiabilitiesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurementsFairValueDisclosuresofFinancialInstrumentLiabilitiesDetail" xlink:type="extended" id="ic89354f6880e4f7eb75f8cf180089c7e_FairValueMeasurementsFairValueDisclosuresofFinancialInstrumentLiabilitiesDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_d8ea4b52-c264-460c-aa34-3c59b9f662a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_26eb828c-ad46-49ff-8976-6c52e671d1d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_d8ea4b52-c264-460c-aa34-3c59b9f662a7" xlink:to="loc_us-gaap_LongTermDebtFairValue_26eb828c-ad46-49ff-8976-6c52e671d1d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_0fac8fbd-af5a-4d41-82a6-b186e1daa7bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_d8ea4b52-c264-460c-aa34-3c59b9f662a7" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_0fac8fbd-af5a-4d41-82a6-b186e1daa7bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_a72da876-5c75-4578-87a8-77edf1b9d474" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_0fac8fbd-af5a-4d41-82a6-b186e1daa7bd" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_a72da876-5c75-4578-87a8-77edf1b9d474" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_a72da876-5c75-4578-87a8-77edf1b9d474_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_a72da876-5c75-4578-87a8-77edf1b9d474" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_a72da876-5c75-4578-87a8-77edf1b9d474_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1c04c3a0-cdd0-4c40-856b-043809fcaf2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_a72da876-5c75-4578-87a8-77edf1b9d474" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1c04c3a0-cdd0-4c40-856b-043809fcaf2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_19cb0e5c-7df1-4200-91c1-692e84750953" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1c04c3a0-cdd0-4c40-856b-043809fcaf2e" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_19cb0e5c-7df1-4200-91c1-692e84750953" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_1ba3f47c-f317-4060-a433-7b79972507a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_19cb0e5c-7df1-4200-91c1-692e84750953" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_1ba3f47c-f317-4060-a433-7b79972507a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_47913af1-96a1-4b9e-9587-2683b4b9b5d4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_19cb0e5c-7df1-4200-91c1-692e84750953" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_47913af1-96a1-4b9e-9587-2683b4b9b5d4" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/HedgingActivities" xlink:type="simple" xlink:href="ame-20200630.xsd#HedgingActivities"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/HedgingActivities" xlink:type="extended" id="i2c9de7b4c38b4b1f89b8fdb28c9e0bd5_HedgingActivities"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/HedgingActivitiesAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#HedgingActivitiesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/HedgingActivitiesAdditionalInformationDetail" xlink:type="extended" id="i10364753183846b2b3598b8bcfb5d9b4_HedgingActivitiesAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_83d451ce-1b2d-4742-89b3-6d06aa2f5895" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAmountOfHedgedItem_65864741-fbf6-4b1d-8fa3-70c1aeb249ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAmountOfHedgedItem"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_83d451ce-1b2d-4742-89b3-6d06aa2f5895" xlink:to="loc_us-gaap_DerivativeAmountOfHedgedItem_65864741-fbf6-4b1d-8fa3-70c1aeb249ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_PercentageOfEffectivenessOnNetInvestmentHedges_ffed7ec6-a645-4a65-a591-592ff2e711ac" xlink:href="ame-20200630.xsd#ame_PercentageOfEffectivenessOnNetInvestmentHedges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_83d451ce-1b2d-4742-89b3-6d06aa2f5895" xlink:to="loc_ame_PercentageOfEffectivenessOnNetInvestmentHedges_ffed7ec6-a645-4a65-a591-592ff2e711ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_434dbabd-0fb4-423c-90a2-aba099ad1147" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_83d451ce-1b2d-4742-89b3-6d06aa2f5895" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_434dbabd-0fb4-423c-90a2-aba099ad1147" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_8049596b-6a4c-4b10-ac91-4b19d50cc1db" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_83d451ce-1b2d-4742-89b3-6d06aa2f5895" xlink:to="loc_us-gaap_DerivativeTable_8049596b-6a4c-4b10-ac91-4b19d50cc1db" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_a99524c2-dde7-4f05-8385-a7f8eb55d623" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_8049596b-6a4c-4b10-ac91-4b19d50cc1db" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_a99524c2-dde7-4f05-8385-a7f8eb55d623" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_a99524c2-dde7-4f05-8385-a7f8eb55d623_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_a99524c2-dde7-4f05-8385-a7f8eb55d623" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_a99524c2-dde7-4f05-8385-a7f8eb55d623_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8bff2a7e-0627-483c-95b5-16589d132904" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_a99524c2-dde7-4f05-8385-a7f8eb55d623" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8bff2a7e-0627-483c-95b5-16589d132904" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_0def8cbc-03fe-43e8-8b80-55e051beb4af" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_8bff2a7e-0627-483c-95b5-16589d132904" xlink:to="loc_us-gaap_ForeignExchangeContractMember_0def8cbc-03fe-43e8-8b80-55e051beb4af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_a84eca72-9af6-418d-988c-6fd80fff0ae8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_8049596b-6a4c-4b10-ac91-4b19d50cc1db" xlink:to="loc_us-gaap_HedgingDesignationAxis_a84eca72-9af6-418d-988c-6fd80fff0ae8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_a84eca72-9af6-418d-988c-6fd80fff0ae8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_a84eca72-9af6-418d-988c-6fd80fff0ae8" xlink:to="loc_us-gaap_HedgingDesignationDomain_a84eca72-9af6-418d-988c-6fd80fff0ae8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_84bdb6a7-1a1c-4ca6-8523-8edf1316d403" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_a84eca72-9af6-418d-988c-6fd80fff0ae8" xlink:to="loc_us-gaap_HedgingDesignationDomain_84bdb6a7-1a1c-4ca6-8523-8edf1316d403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_cd4a8c74-be60-41d0-8020-6df61b5f8460" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_84bdb6a7-1a1c-4ca6-8523-8edf1316d403" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_cd4a8c74-be60-41d0-8020-6df61b5f8460" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_17bea447-6ca5-42bc-bda3-8e4e002dae7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_8049596b-6a4c-4b10-ac91-4b19d50cc1db" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_17bea447-6ca5-42bc-bda3-8e4e002dae7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_17bea447-6ca5-42bc-bda3-8e4e002dae7c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_17bea447-6ca5-42bc-bda3-8e4e002dae7c" xlink:to="loc_us-gaap_HedgingRelationshipDomain_17bea447-6ca5-42bc-bda3-8e4e002dae7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_7b2065cb-96fb-492d-8863-434b0375cdc4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_17bea447-6ca5-42bc-bda3-8e4e002dae7c" xlink:to="loc_us-gaap_HedgingRelationshipDomain_7b2065cb-96fb-492d-8863-434b0375cdc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_BritishPoundDenominatedLoansMember_b3b27151-4a5b-45ae-a338-165e782d1da6" xlink:href="ame-20200630.xsd#ame_BritishPoundDenominatedLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_7b2065cb-96fb-492d-8863-434b0375cdc4" xlink:to="loc_ame_BritishPoundDenominatedLoansMember_b3b27151-4a5b-45ae-a338-165e782d1da6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_EuroLoanMember_9d9778f5-7d6a-47f7-a2e0-d25c47570d08" xlink:href="ame-20200630.xsd#ame_EuroLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_7b2065cb-96fb-492d-8863-434b0375cdc4" xlink:to="loc_ame_EuroLoanMember_9d9778f5-7d6a-47f7-a2e0-d25c47570d08" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Inventoriesnet" xlink:type="simple" xlink:href="ame-20200630.xsd#Inventoriesnet"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Inventoriesnet" xlink:type="extended" id="ie66de584b20a43979881402498067741_Inventoriesnet"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/InventoriesnetTables" xlink:type="simple" xlink:href="ame-20200630.xsd#InventoriesnetTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/InventoriesnetTables" xlink:type="extended" id="ic460b1b869fc4c5a8730b1fc23b9c9c1_InventoriesnetTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/InventoriesnetInventoriesDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#InventoriesnetInventoriesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/InventoriesnetInventoriesDetail" xlink:type="extended" id="i40f50856e84c444599a63a0a7038429b_InventoriesnetInventoriesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Leases" xlink:type="simple" xlink:href="ame-20200630.xsd#Leases"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Leases" xlink:type="extended" id="i9f60b2daa78e440e863246713e2120ce_Leases"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesTables" xlink:type="simple" xlink:href="ame-20200630.xsd#LeasesTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesTables" xlink:type="extended" id="iafe225211a9c41bba4636c5e57a8b6c3_LeasesTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="ame-20200630.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesAdditionalInformationDetails" xlink:type="extended" id="i10c4a2665def44909c1b08c5ddf281a1_LeasesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_1f1e73c3-aad4-48da-b4ec-1dc35835b6a2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_ad49330e-0fa6-4c67-9c7d-f57d2a82f17d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_1f1e73c3-aad4-48da-b4ec-1dc35835b6a2" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_ad49330e-0fa6-4c67-9c7d-f57d2a82f17d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_ddd1a354-ad0c-4486-81d0-d313d547b5e6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_1f1e73c3-aad4-48da-b4ec-1dc35835b6a2" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_ddd1a354-ad0c-4486-81d0-d313d547b5e6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_1ead8370-7341-4f97-8917-060469584465" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_ddd1a354-ad0c-4486-81d0-d313d547b5e6" xlink:to="loc_srt_RangeAxis_1ead8370-7341-4f97-8917-060469584465" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1ead8370-7341-4f97-8917-060469584465_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_1ead8370-7341-4f97-8917-060469584465" xlink:to="loc_srt_RangeMember_1ead8370-7341-4f97-8917-060469584465_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9498b50b-6291-4376-9d6e-e0cbf7067930" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_1ead8370-7341-4f97-8917-060469584465" xlink:to="loc_srt_RangeMember_9498b50b-6291-4376-9d6e-e0cbf7067930" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1036d13f-e07a-447c-9636-f389dd5540cd" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9498b50b-6291-4376-9d6e-e0cbf7067930" xlink:to="loc_srt_MinimumMember_1036d13f-e07a-447c-9636-f389dd5540cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e8592b1e-bfa1-42eb-a997-8130e0c816bb" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9498b50b-6291-4376-9d6e-e0cbf7067930" xlink:to="loc_srt_MaximumMember_e8592b1e-bfa1-42eb-a997-8130e0c816bb" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesComponentsofLeaseExpenseDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#LeasesComponentsofLeaseExpenseDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesComponentsofLeaseExpenseDetail" xlink:type="extended" id="i35645998e34c42408c3b4e258e87b7b1_LeasesComponentsofLeaseExpenseDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesSupplementalBalanceSheetInformationRelatedtoLeasesDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#LeasesSupplementalBalanceSheetInformationRelatedtoLeasesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesSupplementalBalanceSheetInformationRelatedtoLeasesDetail" xlink:type="extended" id="i50e57cd30178402cb3c6bb8fd6aa8587_LeasesSupplementalBalanceSheetInformationRelatedtoLeasesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesSupplementalCashFlowInformationRelatedtoLeasesDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#LeasesSupplementalCashFlowInformationRelatedtoLeasesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesSupplementalCashFlowInformationRelatedtoLeasesDetail" xlink:type="extended" id="i10433ec231e04808a38dc9dd3aae381e_LeasesSupplementalCashFlowInformationRelatedtoLeasesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesMaturitiesofleaseliabilitiesDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#LeasesMaturitiesofleaseliabilitiesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesMaturitiesofleaseliabilitiesDetail" xlink:type="extended" id="i7d311ef9752d4350a64e73ed33465cdd_LeasesMaturitiesofleaseliabilitiesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AcquisitionandDivestiture" xlink:type="simple" xlink:href="ame-20200630.xsd#AcquisitionandDivestiture"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AcquisitionandDivestiture" xlink:type="extended" id="iac7dfa5ae2bf45dcac86e8d23dd0a65d_AcquisitionandDivestiture"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AcquisitionandDivestitureTables" xlink:type="simple" xlink:href="ame-20200630.xsd#AcquisitionandDivestitureTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AcquisitionandDivestitureTables" xlink:type="extended" id="if8343afe57c14957b51b7e1be51839dd_AcquisitionandDivestitureTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AcquisitionandDivestitureAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#AcquisitionandDivestitureAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AcquisitionandDivestitureAdditionalInformationDetail" xlink:type="extended" id="id33fbf9781994560966433cc08c51c38_AcquisitionandDivestitureAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_a5548152-13d0-4a36-bc52-7aa2e8e83522" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_a5548152-13d0-4a36-bc52-7aa2e8e83522" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_91c3e424-4f23-4ad3-a6e3-745026f34ff7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_91c3e424-4f23-4ad3-a6e3-745026f34ff7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_2766cf8d-9738-491f-9b0a-1b63d2ff2ae8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IndefinitelivedIntangibleAssetsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_2766cf8d-9738-491f-9b0a-1b63d2ff2ae8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_335df04e-0df5-4dda-962c-5af6186869b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_335df04e-0df5-4dda-962c-5af6186869b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_403efb17-f12c-48a6-9f91-b93e30a744b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_403efb17-f12c-48a6-9f91-b93e30a744b8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths_10eb5ff3-7321-46be-a5f3-d8ebaabbf0eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths_10eb5ff3-7321-46be-a5f3-d8ebaabbf0eb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo_561b0756-3087-4ce0-9323-b358d0544d4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo_561b0756-3087-4ce0-9323-b358d0544d4a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree_2d7abda4-6d5c-49ee-bf12-aac7d2671ce1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree_2d7abda4-6d5c-49ee-bf12-aac7d2671ce1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour_c7ea00be-12a2-4103-b767-634a3665b5cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour_c7ea00be-12a2-4103-b767-634a3665b5cc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive_1dc53fae-5fe0-4444-8178-b96c7719b364" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive_1dc53fae-5fe0-4444-8178-b96c7719b364" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_c6cbd63d-c285-415f-b7c1-626795a67f61" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_c6cbd63d-c285-415f-b7c1-626795a67f61" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_f1300f49-4193-4e18-abce-ebb2e6a46ce0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_f1300f49-4193-4e18-abce-ebb2e6a46ce0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_IncomeTaxExpenseRelatingToSaleOfBusiness_bdcc4e7b-896c-489a-bc28-17a613b3ef58" xlink:href="ame-20200630.xsd#ame_IncomeTaxExpenseRelatingToSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_ame_IncomeTaxExpenseRelatingToSaleOfBusiness_bdcc4e7b-896c-489a-bc28-17a613b3ef58" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9931246a-9cb4-41f7-bb11-24827c18c443" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_d070bd26-e9fb-48b6-9808-01e864f76131" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9931246a-9cb4-41f7-bb11-24827c18c443" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9096cb31-50e1-4b88-a729-c0a57afe05cd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9931246a-9cb4-41f7-bb11-24827c18c443" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9096cb31-50e1-4b88-a729-c0a57afe05cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9096cb31-50e1-4b88-a729-c0a57afe05cd_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9096cb31-50e1-4b88-a729-c0a57afe05cd" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9096cb31-50e1-4b88-a729-c0a57afe05cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d8588735-c4bb-423f-9faa-8dbd6b81747f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9096cb31-50e1-4b88-a729-c0a57afe05cd" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d8588735-c4bb-423f-9faa-8dbd6b81747f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_da2b342d-26c5-4e52-8c70-f6195e13be9a" xlink:href="ame-20200630.xsd#ame_TwoThousandAndTwentyConsolidatedAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d8588735-c4bb-423f-9faa-8dbd6b81747f" xlink:to="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_da2b342d-26c5-4e52-8c70-f6195e13be9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_KymeraInternationalMember_fd0ee995-a512-4e69-88f6-08417ecb0d2d" xlink:href="ame-20200630.xsd#ame_KymeraInternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d8588735-c4bb-423f-9faa-8dbd6b81747f" xlink:to="loc_ame_KymeraInternationalMember_fd0ee995-a512-4e69-88f6-08417ecb0d2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_fee8f019-0cb6-4b9f-b595-dae168225b61" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9931246a-9cb4-41f7-bb11-24827c18c443" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_fee8f019-0cb6-4b9f-b595-dae168225b61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_fee8f019-0cb6-4b9f-b595-dae168225b61_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_fee8f019-0cb6-4b9f-b595-dae168225b61" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_fee8f019-0cb6-4b9f-b595-dae168225b61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_392073d1-b600-4f13-96f2-7992d47e0e70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_fee8f019-0cb6-4b9f-b595-dae168225b61" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_392073d1-b600-4f13-96f2-7992d47e0e70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_4c7d73ce-4fea-4f67-977c-d951031a3c2c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_392073d1-b600-4f13-96f2-7992d47e0e70" xlink:to="loc_us-gaap_TradeNamesMember_4c7d73ce-4fea-4f67-977c-d951031a3c2c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_47d27ad2-108c-4a25-b5f5-3a134ec3a1bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_392073d1-b600-4f13-96f2-7992d47e0e70" xlink:to="loc_us-gaap_CustomerRelationshipsMember_47d27ad2-108c-4a25-b5f5-3a134ec3a1bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_PurchasedTechnologyMember_6487c739-da13-452b-bd87-bc1341501cee" xlink:href="ame-20200630.xsd#ame_PurchasedTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_392073d1-b600-4f13-96f2-7992d47e0e70" xlink:to="loc_ame_PurchasedTechnologyMember_6487c739-da13-452b-bd87-bc1341501cee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_98da241a-433e-477d-a5f7-acf3ea8e15a2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9931246a-9cb4-41f7-bb11-24827c18c443" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_98da241a-433e-477d-a5f7-acf3ea8e15a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_98da241a-433e-477d-a5f7-acf3ea8e15a2_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_98da241a-433e-477d-a5f7-acf3ea8e15a2" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_98da241a-433e-477d-a5f7-acf3ea8e15a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_76816398-8816-457a-942e-e65b8fa5183d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_98da241a-433e-477d-a5f7-acf3ea8e15a2" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_76816398-8816-457a-942e-e65b8fa5183d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncomeMember_2c4dbfd8-dab6-40c3-bf7f-568695a4f88d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_76816398-8816-457a-942e-e65b8fa5183d" xlink:to="loc_us-gaap_OtherIncomeMember_2c4dbfd8-dab6-40c3-bf7f-568695a4f88d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AcquisitionandDivestitureAllocationofAggregatePurchasePriceofAcquiredNetAssetsDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#AcquisitionandDivestitureAllocationofAggregatePurchasePriceofAcquiredNetAssetsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AcquisitionandDivestitureAllocationofAggregatePurchasePriceofAcquiredNetAssetsDetail" xlink:type="extended" id="i90c1ef52b4c542ff9d46a586546f0968_AcquisitionandDivestitureAllocationofAggregatePurchasePriceofAcquiredNetAssetsDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_3dc421cc-29e4-4bb9-82bc-e55f75e516bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_3dc421cc-29e4-4bb9-82bc-e55f75e516bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_12335a5b-2d3e-4d08-bb1f-dd2f1b7db666" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:to="loc_us-gaap_Goodwill_12335a5b-2d3e-4d08-bb1f-dd2f1b7db666" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_dc20c81d-c994-42f7-ba3c-67c9af026a26" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_dc20c81d-c994-42f7-ba3c-67c9af026a26" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_08a9f7bb-8467-44fc-8c46-89ec6fe5c2cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_08a9f7bb-8467-44fc-8c46-89ec6fe5c2cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_BusinessAcquisitionPurchasePriceAllocationNetWorkingCapitalAndOther_56800c0d-4560-4f14-8f53-368492f323df" xlink:href="ame-20200630.xsd#ame_BusinessAcquisitionPurchasePriceAllocationNetWorkingCapitalAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:to="loc_ame_BusinessAcquisitionPurchasePriceAllocationNetWorkingCapitalAndOther_56800c0d-4560-4f14-8f53-368492f323df" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1efac3c6-674a-41e0-8d4b-b605d5ab22cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1efac3c6-674a-41e0-8d4b-b605d5ab22cc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_c0fd5c93-ee33-4040-838e-16185bf825e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_c0fd5c93-ee33-4040-838e-16185bf825e5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ae0e837f-4396-4842-b1eb-540c6f6866e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_07def7ec-f913-42e1-be72-00e6aa6a3aef" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ae0e837f-4396-4842-b1eb-540c6f6866e9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_806dfe56-c588-4450-87c6-df70b973d570" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ae0e837f-4396-4842-b1eb-540c6f6866e9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_806dfe56-c588-4450-87c6-df70b973d570" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_806dfe56-c588-4450-87c6-df70b973d570_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_806dfe56-c588-4450-87c6-df70b973d570" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_806dfe56-c588-4450-87c6-df70b973d570_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1fc99354-9597-4746-811a-3a7f030f136c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_806dfe56-c588-4450-87c6-df70b973d570" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1fc99354-9597-4746-811a-3a7f030f136c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_3f8a17b9-7bcb-42f5-83b2-38aacd177dee" xlink:href="ame-20200630.xsd#ame_TwoThousandAndTwentyConsolidatedAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1fc99354-9597-4746-811a-3a7f030f136c" xlink:to="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_3f8a17b9-7bcb-42f5-83b2-38aacd177dee" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Goodwill" xlink:type="simple" xlink:href="ame-20200630.xsd#Goodwill"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Goodwill" xlink:type="extended" id="i8958ea44015c440e8fd9457d68bebba0_Goodwill"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/GoodwillTables" xlink:type="simple" xlink:href="ame-20200630.xsd#GoodwillTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/GoodwillTables" xlink:type="extended" id="if0e052abc9484b2eaeccb4995e0d8c53_GoodwillTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/GoodwillChangesinCarryingAmountsofGoodwillbySegmentDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#GoodwillChangesinCarryingAmountsofGoodwillbySegmentDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/GoodwillChangesinCarryingAmountsofGoodwillbySegmentDetail" xlink:type="extended" id="i4709c27d91ab4c0a8cd65cbb3f5493df_GoodwillChangesinCarryingAmountsofGoodwillbySegmentDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_4b0ae9d5-836d-4629-9ed7-da8f0a8ac2a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_d8b8dfe2-c930-4f7d-89a4-90be839aa68a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_4b0ae9d5-836d-4629-9ed7-da8f0a8ac2a7" xlink:to="loc_us-gaap_GoodwillRollForward_d8b8dfe2-c930-4f7d-89a4-90be839aa68a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_8aa9c210-020a-488d-9394-bc4e2729b6e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_d8b8dfe2-c930-4f7d-89a4-90be839aa68a" xlink:to="loc_us-gaap_Goodwill_8aa9c210-020a-488d-9394-bc4e2729b6e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_1312922a-7da8-41e1-9f97-6b26342f3ed4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_d8b8dfe2-c930-4f7d-89a4-90be839aa68a" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_1312922a-7da8-41e1-9f97-6b26342f3ed4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_84585f23-48a3-4995-b368-adb86a91d9e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_d8b8dfe2-c930-4f7d-89a4-90be839aa68a" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_84585f23-48a3-4995-b368-adb86a91d9e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_7c2ba913-5abf-4bb3-b9cd-d7aba0376d08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_d8b8dfe2-c930-4f7d-89a4-90be839aa68a" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_7c2ba913-5abf-4bb3-b9cd-d7aba0376d08" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_a63d20d8-b520-46a2-b51a-7a564b5ccd29" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_6016b15c-6b22-42e4-a08d-9cd69de5fe0c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_4b0ae9d5-836d-4629-9ed7-da8f0a8ac2a7" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_6016b15c-6b22-42e4-a08d-9cd69de5fe0c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_4188d7b1-1a9a-4dde-a46b-6954729005d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_6016b15c-6b22-42e4-a08d-9cd69de5fe0c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_4188d7b1-1a9a-4dde-a46b-6954729005d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4188d7b1-1a9a-4dde-a46b-6954729005d8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4188d7b1-1a9a-4dde-a46b-6954729005d8" xlink:to="loc_us-gaap_SegmentDomain_4188d7b1-1a9a-4dde-a46b-6954729005d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8c2c51db-4406-492e-b138-e0e19ac26625" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4188d7b1-1a9a-4dde-a46b-6954729005d8" xlink:to="loc_us-gaap_SegmentDomain_8c2c51db-4406-492e-b138-e0e19ac26625" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_e2d11cef-70ca-4f7c-b745-d953ba890b09" xlink:href="ame-20200630.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8c2c51db-4406-492e-b138-e0e19ac26625" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_e2d11cef-70ca-4f7c-b745-d953ba890b09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_5ab4158e-b674-4c30-84c3-4c67efe953a7" xlink:href="ame-20200630.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8c2c51db-4406-492e-b138-e0e19ac26625" xlink:to="loc_ame_ElectromechanicalGroupMember_5ab4158e-b674-4c30-84c3-4c67efe953a7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/IncomeTaxes" xlink:type="simple" xlink:href="ame-20200630.xsd#IncomeTaxes"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/IncomeTaxes" xlink:type="extended" id="ie6e0a4f0735945168eeee14df6f7ca84_IncomeTaxes"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/IncomeTaxesTables" xlink:type="simple" xlink:href="ame-20200630.xsd#IncomeTaxesTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/IncomeTaxesTables" xlink:type="extended" id="i22aca1ca572044308e38b7db6c3b7d70_IncomeTaxesTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/IncomeTaxesAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#IncomeTaxesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/IncomeTaxesAdditionalInformationDetail" xlink:type="extended" id="i81d417417d994fb2965cf53e1a68065a_IncomeTaxesAdditionalInformationDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/IncomeTaxesReconciliationofLiabilityforUncertainTaxPositionsDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#IncomeTaxesReconciliationofLiabilityforUncertainTaxPositionsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/IncomeTaxesReconciliationofLiabilityforUncertainTaxPositionsDetail" xlink:type="extended" id="i4847bd28e0d44f01864b0191a4b8dd82_IncomeTaxesReconciliationofLiabilityforUncertainTaxPositionsDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensation" xlink:type="simple" xlink:href="ame-20200630.xsd#ShareBasedCompensation"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensation" xlink:type="extended" id="i793a00e75e1443e88ef3049691c085a7_ShareBasedCompensation"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationTables" xlink:type="simple" xlink:href="ame-20200630.xsd#ShareBasedCompensationTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationTables" xlink:type="extended" id="i85c197a1bf7c4815979419bead51fff9_ShareBasedCompensationTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#ShareBasedCompensationAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationAdditionalInformationDetail" xlink:type="extended" id="i20384600a6204966a9f61096e6bfd78c_ShareBasedCompensationAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_0eb02510-5788-4521-a053-79b4c0de7d27" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_0eb02510-5788-4521-a053-79b4c0de7d27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_8126da9e-7a2a-42da-ab28-cd493beba072" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_8126da9e-7a2a-42da-ab28-cd493beba072" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_8682f4da-79ad-4936-87db-73c9719eedb9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_8682f4da-79ad-4936-87db-73c9719eedb9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_8d7d5ac4-0180-4353-9c9c-71754586d707" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_8d7d5ac4-0180-4353-9c9c-71754586d707" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_d30c42d2-d94f-43cb-8661-2503cda3480a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_d30c42d2-d94f-43cb-8661-2503cda3480a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_1a888cda-da9d-4f03-99cf-ee4a5d77761b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_1a888cda-da9d-4f03-99cf-ee4a5d77761b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_05adba0d-fa56-462f-8d41-98273140d1cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_05adba0d-fa56-462f-8d41-98273140d1cf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_71a807e1-9056-405c-8756-8e3f15e6f08f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights_71a807e1-9056-405c-8756-8e3f15e6f08f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_99c6f6e1-e717-4e56-afbe-96c0033f8f34" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_99c6f6e1-e717-4e56-afbe-96c0033f8f34" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_37bbf32c-cc96-4da6-971b-f1876988e242" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_37bbf32c-cc96-4da6-971b-f1876988e242" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1047b527-ef7e-4ce3-a2df-7d1716cd62d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1047b527-ef7e-4ce3-a2df-7d1716cd62d3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_af785ee6-afa0-4947-b13c-075b8edef161" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_af785ee6-afa0-4947-b13c-075b8edef161" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_c5c6a507-5d09-4845-a421-1c247f3ba8f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_c5c6a507-5d09-4845-a421-1c247f3ba8f0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_2c672e78-fece-4a2f-a6b7-dc5acf73f046" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_2c672e78-fece-4a2f-a6b7-dc5acf73f046" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37761055-9ecd-4309-b041-1b44556050c2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a9fa4e5d-d27f-438f-bc3a-3b82449bc2b4" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37761055-9ecd-4309-b041-1b44556050c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d109484d-f2af-4b1a-a703-e1bc8a6d01a3" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37761055-9ecd-4309-b041-1b44556050c2" xlink:to="loc_srt_RangeAxis_d109484d-f2af-4b1a-a703-e1bc8a6d01a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d109484d-f2af-4b1a-a703-e1bc8a6d01a3_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d109484d-f2af-4b1a-a703-e1bc8a6d01a3" xlink:to="loc_srt_RangeMember_d109484d-f2af-4b1a-a703-e1bc8a6d01a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_903cae51-bf08-42a3-9cab-22f01f2ebc72" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d109484d-f2af-4b1a-a703-e1bc8a6d01a3" xlink:to="loc_srt_RangeMember_903cae51-bf08-42a3-9cab-22f01f2ebc72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9bd0e16b-f6c1-407b-8b6a-3d7e7c216b46" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_903cae51-bf08-42a3-9cab-22f01f2ebc72" xlink:to="loc_srt_MaximumMember_9bd0e16b-f6c1-407b-8b6a-3d7e7c216b46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_b21af5ba-8f7d-46b2-8c86-5fbd5d2dcd14" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_903cae51-bf08-42a3-9cab-22f01f2ebc72" xlink:to="loc_srt_MinimumMember_b21af5ba-8f7d-46b2-8c86-5fbd5d2dcd14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_bd12b14b-382a-46ea-9ae7-2b67ce895999" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37761055-9ecd-4309-b041-1b44556050c2" xlink:to="loc_us-gaap_AwardTypeAxis_bd12b14b-382a-46ea-9ae7-2b67ce895999" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd12b14b-382a-46ea-9ae7-2b67ce895999_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_bd12b14b-382a-46ea-9ae7-2b67ce895999" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd12b14b-382a-46ea-9ae7-2b67ce895999_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_99538848-5874-449a-b9cd-61d445687194" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_bd12b14b-382a-46ea-9ae7-2b67ce895999" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_99538848-5874-449a-b9cd-61d445687194" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_e35c9f9d-b2a5-4270-a1fd-e1b7f7e5ac1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_99538848-5874-449a-b9cd-61d445687194" xlink:to="loc_us-gaap_RestrictedStockMember_e35c9f9d-b2a5-4270-a1fd-e1b7f7e5ac1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_e59e81e7-a4b6-4799-abb7-15c4bf7dbbe2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_99538848-5874-449a-b9cd-61d445687194" xlink:to="loc_us-gaap_EmployeeStockOptionMember_e59e81e7-a4b6-4799-abb7-15c4bf7dbbe2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_PerformanceRestrictedStockUnitsMember_9d8ee74a-ca65-43b7-8051-4369cdda4e1c" xlink:href="ame-20200630.xsd#ame_PerformanceRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_99538848-5874-449a-b9cd-61d445687194" xlink:to="loc_ame_PerformanceRestrictedStockUnitsMember_9d8ee74a-ca65-43b7-8051-4369cdda4e1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_NonVestedStockOptionsMember_80db9873-26df-4afc-b1e8-60d998e3b1b5" xlink:href="ame-20200630.xsd#ame_NonVestedStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_99538848-5874-449a-b9cd-61d445687194" xlink:to="loc_ame_NonVestedStockOptionsMember_80db9873-26df-4afc-b1e8-60d998e3b1b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_dd671f75-2a6c-43e8-94e6-dedcff6281f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_37761055-9ecd-4309-b041-1b44556050c2" xlink:to="loc_us-gaap_VestingAxis_dd671f75-2a6c-43e8-94e6-dedcff6281f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_dd671f75-2a6c-43e8-94e6-dedcff6281f8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_dd671f75-2a6c-43e8-94e6-dedcff6281f8" xlink:to="loc_us-gaap_VestingDomain_dd671f75-2a6c-43e8-94e6-dedcff6281f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_dd671f75-2a6c-43e8-94e6-dedcff6281f8" xlink:to="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8add4e57-174e-407f-a93b-a00592fae1b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_8add4e57-174e-407f-a93b-a00592fae1b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_4a2abe37-0145-4e98-8c6a-8725d977b2b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_4a2abe37-0145-4e98-8c6a-8725d977b2b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_c8efc7ea-c688-46ee-a6b0-23977a0496fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_c8efc7ea-c688-46ee-a6b0-23977a0496fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ShareBasedPaymentArrangementTrancheFourMember_c8377d43-175f-4f71-90b4-267493d2d700" xlink:href="ame-20200630.xsd#ame_ShareBasedPaymentArrangementTrancheFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:to="loc_ame_ShareBasedPaymentArrangementTrancheFourMember_c8377d43-175f-4f71-90b4-267493d2d700" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_RestrictedStockGrantedPriorDateMember_5908aa59-8580-4041-88a4-0df9ce3bb26e" xlink:href="ame-20200630.xsd#ame_RestrictedStockGrantedPriorDateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:to="loc_ame_RestrictedStockGrantedPriorDateMember_5908aa59-8580-4041-88a4-0df9ce3bb26e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_NonEmployeeDirectorsRestrictedStockMember_93491eee-d6e7-4ad4-b161-7888a1ed4652" xlink:href="ame-20200630.xsd#ame_NonEmployeeDirectorsRestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:to="loc_ame_NonEmployeeDirectorsRestrictedStockMember_93491eee-d6e7-4ad4-b161-7888a1ed4652" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_OfficersAndKeyManagementEmployeesMember_7d46704f-bd24-4a64-9f40-f38272517d79" xlink:href="ame-20200630.xsd#ame_OfficersAndKeyManagementEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a5e5cf81-19fa-4514-ab3b-0683b9388b60" xlink:to="loc_ame_OfficersAndKeyManagementEmployeesMember_7d46704f-bd24-4a64-9f40-f38272517d79" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationTotalShareBasedCompensationExpenseDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#ShareBasedCompensationTotalShareBasedCompensationExpenseDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationTotalShareBasedCompensationExpenseDetail" xlink:type="extended" id="i19ede35de257486089e8921043e0fa32_ShareBasedCompensationTotalShareBasedCompensationExpenseDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationWeightedAverageAssumptionsUsedforEstimatingFairValuesofStockOptionsGrantedDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#ShareBasedCompensationWeightedAverageAssumptionsUsedforEstimatingFairValuesofStockOptionsGrantedDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationWeightedAverageAssumptionsUsedforEstimatingFairValuesofStockOptionsGrantedDetail" xlink:type="extended" id="idc726d220b8641b081ccabb3b7c8fbec_ShareBasedCompensationWeightedAverageAssumptionsUsedforEstimatingFairValuesofStockOptionsGrantedDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationSummaryofStockOptionActivityandRelatedInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#ShareBasedCompensationSummaryofStockOptionActivityandRelatedInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationSummaryofStockOptionActivityandRelatedInformationDetail" xlink:type="extended" id="i9d3361dac1304f99b7ee317a6b062837_ShareBasedCompensationSummaryofStockOptionActivityandRelatedInformationDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationSummaryofNonvestedRestrictedStockActivityandRelatedInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#ShareBasedCompensationSummaryofNonvestedRestrictedStockActivityandRelatedInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationSummaryofNonvestedRestrictedStockActivityandRelatedInformationDetail" xlink:type="extended" id="i4d3411272f044289aacb89d238b587f4_ShareBasedCompensationSummaryofNonvestedRestrictedStockActivityandRelatedInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7625d4a7-1e20-4442-97e0-6f016557506e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9996f43c-53fa-46fb-955c-fa80b40677e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7625d4a7-1e20-4442-97e0-6f016557506e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9996f43c-53fa-46fb-955c-fa80b40677e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_68d572b1-ec43-4d81-8a7e-b94603b529fa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9996f43c-53fa-46fb-955c-fa80b40677e9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_68d572b1-ec43-4d81-8a7e-b94603b529fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c95a8581-5407-4b1e-8901-3c5484a38f25" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9996f43c-53fa-46fb-955c-fa80b40677e9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c95a8581-5407-4b1e-8901-3c5484a38f25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6c241f3c-57d8-4f23-9bdf-9cd8fa402050" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9996f43c-53fa-46fb-955c-fa80b40677e9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6c241f3c-57d8-4f23-9bdf-9cd8fa402050" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_3dde6b18-9b3d-452f-9a92-1b5a306c82d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9996f43c-53fa-46fb-955c-fa80b40677e9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_3dde6b18-9b3d-452f-9a92-1b5a306c82d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_812f0e43-5154-4fda-8893-1948ffd1d70b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_76f8af85-8e69-4465-91a2-22c676cbd87a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7625d4a7-1e20-4442-97e0-6f016557506e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_76f8af85-8e69-4465-91a2-22c676cbd87a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_f26a6d87-a412-4a46-93cc-144a0ec5ab58" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_76f8af85-8e69-4465-91a2-22c676cbd87a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_f26a6d87-a412-4a46-93cc-144a0ec5ab58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_f4336ae4-899f-45c0-9f59-368c46c1e9b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_76f8af85-8e69-4465-91a2-22c676cbd87a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_f4336ae4-899f-45c0-9f59-368c46c1e9b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_fd282c81-051d-4cbe-a709-3061957c5622" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_76f8af85-8e69-4465-91a2-22c676cbd87a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_fd282c81-051d-4cbe-a709-3061957c5622" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b15707e9-3513-4e56-870c-1214f944f9e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_76f8af85-8e69-4465-91a2-22c676cbd87a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b15707e9-3513-4e56-870c-1214f944f9e1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1cc2185a-3083-4e38-9e5e-afc631a396df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_49aa2c7c-dbc8-4467-8d21-a1741a683a84" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7625d4a7-1e20-4442-97e0-6f016557506e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_49aa2c7c-dbc8-4467-8d21-a1741a683a84" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_11298ec1-37e0-4276-bc42-ae2883b5904f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_49aa2c7c-dbc8-4467-8d21-a1741a683a84" xlink:to="loc_us-gaap_AwardTypeAxis_11298ec1-37e0-4276-bc42-ae2883b5904f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_11298ec1-37e0-4276-bc42-ae2883b5904f_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_11298ec1-37e0-4276-bc42-ae2883b5904f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_11298ec1-37e0-4276-bc42-ae2883b5904f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b590b1a3-d61f-4850-8ada-b9fd0fba47e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_11298ec1-37e0-4276-bc42-ae2883b5904f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b590b1a3-d61f-4850-8ada-b9fd0fba47e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_3d623f8e-4d87-4276-b489-f66d8aace230" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b590b1a3-d61f-4850-8ada-b9fd0fba47e3" xlink:to="loc_us-gaap_RestrictedStockMember_3d623f8e-4d87-4276-b489-f66d8aace230" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RetirementandPensionPlans" xlink:type="simple" xlink:href="ame-20200630.xsd#RetirementandPensionPlans"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RetirementandPensionPlans" xlink:type="extended" id="i7110aa4f7daa435d888d3c81ea38d784_RetirementandPensionPlans"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RetirementandPensionPlansTables" xlink:type="simple" xlink:href="ame-20200630.xsd#RetirementandPensionPlansTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RetirementandPensionPlansTables" xlink:type="extended" id="ifc55fc8032f04b5faf90053c92829b18_RetirementandPensionPlansTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RetirementandPensionPlansComponentsofNetPeriodicPensionBenefitExpenseIncomeDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RetirementandPensionPlansComponentsofNetPeriodicPensionBenefitExpenseIncomeDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RetirementandPensionPlansComponentsofNetPeriodicPensionBenefitExpenseIncomeDetail" xlink:type="extended" id="i1cfa2438795a43659c193b26f4a49ad8_RetirementandPensionPlansComponentsofNetPeriodicPensionBenefitExpenseIncomeDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RetirementandPensionPlansAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RetirementandPensionPlansAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RetirementandPensionPlansAdditionalInformationDetail" xlink:type="extended" id="ie0331507c5d84f44bcad042563576121_RetirementandPensionPlansAdditionalInformationDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Contingencies" xlink:type="simple" xlink:href="ame-20200630.xsd#Contingencies"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Contingencies" xlink:type="extended" id="ia84ae477984e4d0581edbe902f7bedf5_Contingencies"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ContingenciesAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#ContingenciesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ContingenciesAdditionalInformationDetail" xlink:type="extended" id="iae03b9ed2d674d809ba337a2de2b20c9_ContingenciesAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SiteContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsNamedPotentiallyResponsibleParty_619cbad2-c43a-47d6-bcc9-8fff395b1655" xlink:href="ame-20200630.xsd#ame_LossContingencyNumberOfNonOwnedSitesCompanyIsNamedPotentiallyResponsibleParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsNamedPotentiallyResponsibleParty_619cbad2-c43a-47d6-bcc9-8fff395b1655" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsIdentifiedAsDeMinimisParty_b3b97d79-dce1-4b29-b6c1-daa5099d976e" xlink:href="ame-20200630.xsd#ame_LossContingencyNumberOfNonOwnedSitesCompanyIsIdentifiedAsDeMinimisParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsIdentifiedAsDeMinimisParty_b3b97d79-dce1-4b29-b6c1-daa5099d976e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsInAgreementOnAmountOfDeMinimisSettlement_64fe6f4a-2662-4d27-8306-ca663929ec4c" xlink:href="ame-20200630.xsd#ame_LossContingencyNumberOfNonOwnedSitesCompanyIsInAgreementOnAmountOfDeMinimisSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsInAgreementOnAmountOfDeMinimisSettlement_64fe6f4a-2662-4d27-8306-ca663929ec4c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsContinuingToInvestigate_756bfe5b-c551-4e8a-91ab-04b64335de81" xlink:href="ame-20200630.xsd#ame_LossContingencyNumberOfNonOwnedSitesCompanyIsContinuingToInvestigate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsContinuingToInvestigate_756bfe5b-c551-4e8a-91ab-04b64335de81" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingencies_01019eee-6f35-4b99-b7d7-70dcee87cf92" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccrualForEnvironmentalLossContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingencies_01019eee-6f35-4b99-b7d7-70dcee87cf92" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationExpense_de783bb8-62f9-4e1e-9bf6-138f68d6b755" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EnvironmentalRemediationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_us-gaap_EnvironmentalRemediationExpense_de783bb8-62f9-4e1e-9bf6-138f68d6b755" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForEnvironmentalLiabilities_d59c78b6-5765-4533-bf4c-47e4dd21f2ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForEnvironmentalLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_us-gaap_PaymentsForEnvironmentalLiabilities_d59c78b6-5765-4533-bf4c-47e4dd21f2ef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingenciesForeignCurrencyTranslationGainLoss_e1fd9ba1-8a4e-4a62-ab9a-bfc1064487b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccrualForEnvironmentalLossContingenciesForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingenciesForeignCurrencyTranslationGainLoss_e1fd9ba1-8a4e-4a62-ab9a-bfc1064487b3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingenciesComponentAmount_fb688d10-797f-4bc7-b1ba-5b1e5e8544ba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccrualForEnvironmentalLossContingenciesComponentAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingenciesComponentAmount_fb688d10-797f-4bc7-b1ba-5b1e5e8544ba" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_43f5e0c1-8a93-4127-8bbb-edbd8a64d77a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_43f5e0c1-8a93-4127-8bbb-edbd8a64d77a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_LossContingencyNumberOfClassActionLawsuits_b3e63c8f-d936-498a-a28c-794a2e2ef30e" xlink:href="ame-20200630.xsd#ame_LossContingencyNumberOfClassActionLawsuits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_ame_LossContingencyNumberOfClassActionLawsuits_b3e63c8f-d936-498a-a28c-794a2e2ef30e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SiteContingencyTable_8dc2ff3d-8f8b-4e5b-83f9-b7e9de6e5f7a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SiteContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SiteContingencyLineItems_e7cc2573-c986-48cd-b97e-79205791bfd6" xlink:to="loc_us-gaap_SiteContingencyTable_8dc2ff3d-8f8b-4e5b-83f9-b7e9de6e5f7a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteAxis_9a9ef527-2e85-4ee3-880f-bb7d94a84787" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EnvironmentalRemediationSiteAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SiteContingencyTable_8dc2ff3d-8f8b-4e5b-83f9-b7e9de6e5f7a" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteAxis_9a9ef527-2e85-4ee3-880f-bb7d94a84787" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_9a9ef527-2e85-4ee3-880f-bb7d94a84787_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_9a9ef527-2e85-4ee3-880f-bb7d94a84787" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_9a9ef527-2e85-4ee3-880f-bb7d94a84787_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_8bb55169-a06f-4691-9290-894ff4b31efa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_9a9ef527-2e85-4ee3-880f-bb7d94a84787" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_8bb55169-a06f-4691-9290-894ff4b31efa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_HccMember_65fbe5ab-0ae4-48e2-8e85-a40cf393eba8" xlink:href="ame-20200630.xsd#ame_HccMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_8bb55169-a06f-4691-9290-894ff4b31efa" xlink:to="loc_ame_HccMember_65fbe5ab-0ae4-48e2-8e85-a40cf393eba8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RealignmentCosts" xlink:type="simple" xlink:href="ame-20200630.xsd#RealignmentCosts"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RealignmentCosts" xlink:type="extended" id="i963aa8eb5da2452a858798975a0c5be3_RealignmentCosts"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RealignmentCostsTables" xlink:type="simple" xlink:href="ame-20200630.xsd#RealignmentCostsTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RealignmentCostsTables" xlink:type="extended" id="i23e8ff5bfff243259eac8edd6d559aa3_RealignmentCostsTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RealignmentCostsScheduleofAccruedLiabilitiesinCompanysConsolidatedBalanceSheetIncludedAmountsRelatedtoRealignmentCostsDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RealignmentCostsScheduleofAccruedLiabilitiesinCompanysConsolidatedBalanceSheetIncludedAmountsRelatedtoRealignmentCostsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RealignmentCostsScheduleofAccruedLiabilitiesinCompanysConsolidatedBalanceSheetIncludedAmountsRelatedtoRealignmentCostsDetail" xlink:type="extended" id="i1919e8646f244c76b2c95fd8c8edf8a2_RealignmentCostsScheduleofAccruedLiabilitiesinCompanysConsolidatedBalanceSheetIncludedAmountsRelatedtoRealignmentCostsDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RealignmentCostsAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20200630.xsd#RealignmentCostsAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RealignmentCostsAdditionalInformationDetail" xlink:type="extended" id="ia1f2d9d82cf74322b450f6f382d7ccc8_RealignmentCostsAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_1ace98a4-e4f2-4fea-9fd2-be94f3a7f32f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_9a07a772-afb2-401b-818f-b7780c364675" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1ace98a4-e4f2-4fea-9fd2-be94f3a7f32f" xlink:to="loc_us-gaap_RestructuringCharges_9a07a772-afb2-401b-818f-b7780c364675" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_EffectOnNetIncomeLoss_0d258b7a-d582-4dcb-99ed-1565744f1f17" xlink:href="ame-20200630.xsd#ame_EffectOnNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1ace98a4-e4f2-4fea-9fd2-be94f3a7f32f" xlink:to="loc_ame_EffectOnNetIncomeLoss_0d258b7a-d582-4dcb-99ed-1565744f1f17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_EffectOnEarningsPerShareDiluted_e7b2734f-daaa-412d-9f1c-c4f4a2159c56" xlink:href="ame-20200630.xsd#ame_EffectOnEarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1ace98a4-e4f2-4fea-9fd2-be94f3a7f32f" xlink:to="loc_ame_EffectOnEarningsPerShareDiluted_e7b2734f-daaa-412d-9f1c-c4f4a2159c56" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_894935c1-b6f9-4d57-a027-99fe02ab70ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1ace98a4-e4f2-4fea-9fd2-be94f3a7f32f" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_894935c1-b6f9-4d57-a027-99fe02ab70ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_94dcf0c7-0121-4842-bf17-24f03a2f7d3b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_894935c1-b6f9-4d57-a027-99fe02ab70ae" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_94dcf0c7-0121-4842-bf17-24f03a2f7d3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_94dcf0c7-0121-4842-bf17-24f03a2f7d3b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_94dcf0c7-0121-4842-bf17-24f03a2f7d3b" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_94dcf0c7-0121-4842-bf17-24f03a2f7d3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_0eec4c93-2e11-450a-b939-7cf6cf3059bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_94dcf0c7-0121-4842-bf17-24f03a2f7d3b" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_0eec4c93-2e11-450a-b939-7cf6cf3059bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_da3ca125-ded8-4cc7-8444-a68d9b020bbe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_0eec4c93-2e11-450a-b939-7cf6cf3059bb" xlink:to="loc_us-gaap_CostOfSalesMember_da3ca125-ded8-4cc7-8444-a68d9b020bbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0240b5d7-3440-4d59-aa01-5d0cb87b07ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_0eec4c93-2e11-450a-b939-7cf6cf3059bb" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0240b5d7-3440-4d59-aa01-5d0cb87b07ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_eccca616-8741-4292-9e96-03d64efc45fa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_894935c1-b6f9-4d57-a027-99fe02ab70ae" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_eccca616-8741-4292-9e96-03d64efc45fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_eccca616-8741-4292-9e96-03d64efc45fa_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_eccca616-8741-4292-9e96-03d64efc45fa" xlink:to="loc_us-gaap_SegmentDomain_eccca616-8741-4292-9e96-03d64efc45fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d4f332b9-7cd1-41e8-ab93-7bf3d3f8ced1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_eccca616-8741-4292-9e96-03d64efc45fa" xlink:to="loc_us-gaap_SegmentDomain_d4f332b9-7cd1-41e8-ab93-7bf3d3f8ced1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_6de81464-e8b2-487d-96fe-493acc1f2d7c" xlink:href="ame-20200630.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d4f332b9-7cd1-41e8-ab93-7bf3d3f8ced1" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_6de81464-e8b2-487d-96fe-493acc1f2d7c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_f53b22fd-fa90-4b12-a8c6-af6b49a1221f" xlink:href="ame-20200630.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d4f332b9-7cd1-41e8-ab93-7bf3d3f8ced1" xlink:to="loc_ame_ElectromechanicalGroupMember_f53b22fd-fa90-4b12-a8c6-af6b49a1221f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_148bda7b-b5d3-453d-b41e-ac802a5ee8bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_894935c1-b6f9-4d57-a027-99fe02ab70ae" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_148bda7b-b5d3-453d-b41e-ac802a5ee8bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_148bda7b-b5d3-453d-b41e-ac802a5ee8bc_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_148bda7b-b5d3-453d-b41e-ac802a5ee8bc" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_148bda7b-b5d3-453d-b41e-ac802a5ee8bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_5fac6f40-1e3a-4f00-a2c4-ef29af709d73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_148bda7b-b5d3-453d-b41e-ac802a5ee8bc" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_5fac6f40-1e3a-4f00-a2c4-ef29af709d73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ReductionInWorkforceMember_4d174737-131d-4dd5-9cc5-a3c1473d3ab7" xlink:href="ame-20200630.xsd#ame_ReductionInWorkforceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5fac6f40-1e3a-4f00-a2c4-ef29af709d73" xlink:to="loc_ame_ReductionInWorkforceMember_4d174737-131d-4dd5-9cc5-a3c1473d3ab7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_ec0bcd7f-91d3-40fe-95f1-0bdc8dc9c9e5" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_894935c1-b6f9-4d57-a027-99fe02ab70ae" xlink:to="loc_srt_ConsolidationItemsAxis_ec0bcd7f-91d3-40fe-95f1-0bdc8dc9c9e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_ec0bcd7f-91d3-40fe-95f1-0bdc8dc9c9e5_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_ec0bcd7f-91d3-40fe-95f1-0bdc8dc9c9e5" xlink:to="loc_srt_ConsolidationItemsDomain_ec0bcd7f-91d3-40fe-95f1-0bdc8dc9c9e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_b2c16611-db51-4667-a193-7d1a2ed5e219" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_ec0bcd7f-91d3-40fe-95f1-0bdc8dc9c9e5" xlink:to="loc_srt_ConsolidationItemsDomain_b2c16611-db51-4667-a193-7d1a2ed5e219" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_30595f36-be25-4ea5-997f-4204c0fbeb7a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_b2c16611-db51-4667-a193-7d1a2ed5e219" xlink:to="loc_us-gaap_OperatingSegmentsMember_30595f36-be25-4ea5-997f-4204c0fbeb7a" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
