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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:65610d82-e65d-4862-a0b6-97ab1d7c8561,g:01dcc3e8-8481-49d5-b14a-836dea25e066-->
<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-20210331.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/CoverPage" xlink:type="extended" id="i71ce4fb27df74ab8893928a51fe120d0_CoverPage"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedStatementofIncome" xlink:type="simple" xlink:href="ame-20210331.xsd#ConsolidatedStatementofIncome"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedStatementofIncome" xlink:type="extended" id="i917aa74083c44124a098c53d887ee05c_ConsolidatedStatementofIncome"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/CondensedConsolidatedStatementofComprehensiveIncome" xlink:type="simple" xlink:href="ame-20210331.xsd#CondensedConsolidatedStatementofComprehensiveIncome"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/CondensedConsolidatedStatementofComprehensiveIncome" xlink:type="extended" id="ia7ae2eba8f894ee382496a67be9883c0_CondensedConsolidatedStatementofComprehensiveIncome"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedBalanceSheet" xlink:type="simple" xlink:href="ame-20210331.xsd#ConsolidatedBalanceSheet"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedBalanceSheet" xlink:type="extended" id="i648ce85aaef649ea948707846c77da92_ConsolidatedBalanceSheet"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedStatementofStockholdersEquity" xlink:type="simple" xlink:href="ame-20210331.xsd#ConsolidatedStatementofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedStatementofStockholdersEquity" xlink:type="extended" id="i4fd76f5539ae4d7f8667f4de93bf0d64_ConsolidatedStatementofStockholdersEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_b89cea13-2c96-4983-88f8-e059b7313ab2" 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_IncreaseDecreaseInStockholdersEquityRollForward_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" 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_b89cea13-2c96-4983-88f8-e059b7313ab2" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_038411a1-9ee6-4555-9d98-6c6182a252c6" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_StockholdersEquity_038411a1-9ee6-4555-9d98-6c6182a252c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_d8f3d49c-0a3c-49fe-814a-26ec7627404d" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_d8f3d49c-0a3c-49fe-814a-26ec7627404d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_5823cd9d-c07f-445e-a8d0-5f08a481a744" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_5823cd9d-c07f-445e-a8d0-5f08a481a744" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e14f6583-d9e8-405f-9aec-1d9f5ebc95b6" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_e14f6583-d9e8-405f-9aec-1d9f5ebc95b6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4d8117d3-0a74-4ea8-9dcd-2e177e3aa22e" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_NetIncomeLoss_4d8117d3-0a74-4ea8-9dcd-2e177e3aa22e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_f019f5f3-1bed-41fd-9000-83e32244e8ec" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_DividendsCommonStockCash_f019f5f3-1bed-41fd-9000-83e32244e8ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_d617605e-8cd7-44c1-8867-f28965466be0" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_StockholdersEquityOther_d617605e-8cd7-44c1-8867-f28965466be0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_b7ebd7d3-2a07-43dc-8344-b3758d7c66e9" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_b7ebd7d3-2a07-43dc-8344-b3758d7c66e9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_4612a975-9e8b-496c-a860-328d6b4b9cff" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_4612a975-9e8b-496c-a860-328d6b4b9cff" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax_33adc20e-26ed-4a8c-8f18-33a79412c9e2" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax_33adc20e-26ed-4a8c-8f18-33a79412c9e2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_99d1446c-8424-4320-94c1-d5b0c3b2bf17" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_99d1446c-8424-4320-94c1-d5b0c3b2bf17" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_9ec2595b-03b0-40c0-8859-3510314ab4fe" 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_684bb7fa-a37f-4dfc-bdfa-fccc087e5c42" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_9ec2595b-03b0-40c0-8859-3510314ab4fe" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_61e80053-71ed-4754-8b01-1a02a184bc0c" 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_282d64b5-66f2-448d-96a4-90a3532a7982" 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_b89cea13-2c96-4983-88f8-e059b7313ab2" xlink:to="loc_us-gaap_StatementTable_282d64b5-66f2-448d-96a4-90a3532a7982" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_0d077a39-6586-4dd4-a84a-f14548ddf56d" 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_282d64b5-66f2-448d-96a4-90a3532a7982" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_0d077a39-6586-4dd4-a84a-f14548ddf56d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_0d077a39-6586-4dd4-a84a-f14548ddf56d_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_0d077a39-6586-4dd4-a84a-f14548ddf56d" xlink:to="loc_us-gaap_EquityComponentDomain_0d077a39-6586-4dd4-a84a-f14548ddf56d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d44b4cbf-69ae-4af0-b948-a64506e5df20" 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_0d077a39-6586-4dd4-a84a-f14548ddf56d" xlink:to="loc_us-gaap_EquityComponentDomain_d44b4cbf-69ae-4af0-b948-a64506e5df20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_d49fc9b7-de48-4c13-9261-08fca5c7ba27" 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_d44b4cbf-69ae-4af0-b948-a64506e5df20" xlink:to="loc_us-gaap_CommonStockMember_d49fc9b7-de48-4c13-9261-08fca5c7ba27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_8a5a3121-ac02-49a7-bc6d-aea029977d05" 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_d44b4cbf-69ae-4af0-b948-a64506e5df20" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_8a5a3121-ac02-49a7-bc6d-aea029977d05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_2055fecc-b79e-4d10-9755-78c6ad00da1b" 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_d44b4cbf-69ae-4af0-b948-a64506e5df20" xlink:to="loc_us-gaap_RetainedEarningsMember_2055fecc-b79e-4d10-9755-78c6ad00da1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_f2fa1c32-b464-4150-98cc-c25d158d0487" 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_d44b4cbf-69ae-4af0-b948-a64506e5df20" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_f2fa1c32-b464-4150-98cc-c25d158d0487" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_74f6b26c-e22a-4874-a924-9be1a3a44b9c" 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_d44b4cbf-69ae-4af0-b948-a64506e5df20" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_74f6b26c-e22a-4874-a924-9be1a3a44b9c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_11c3a602-abdc-487d-8255-75001cca2ecf" 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_d44b4cbf-69ae-4af0-b948-a64506e5df20" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_11c3a602-abdc-487d-8255-75001cca2ecf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_f9c7477f-57e9-4f46-81a8-4436a6c05c8f" 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_d44b4cbf-69ae-4af0-b948-a64506e5df20" xlink:to="loc_us-gaap_TreasuryStockMember_f9c7477f-57e9-4f46-81a8-4436a6c05c8f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_ba8268f3-83f8-4a11-83f7-6da489656032" 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_282d64b5-66f2-448d-96a4-90a3532a7982" xlink:to="loc_srt_RestatementAxis_ba8268f3-83f8-4a11-83f7-6da489656032" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_ba8268f3-83f8-4a11-83f7-6da489656032_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_ba8268f3-83f8-4a11-83f7-6da489656032" xlink:to="loc_srt_RestatementDomain_ba8268f3-83f8-4a11-83f7-6da489656032_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_1c322346-da6a-41e1-86a3-4473fdf5bb6f" 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_ba8268f3-83f8-4a11-83f7-6da489656032" xlink:to="loc_srt_RestatementDomain_1c322346-da6a-41e1-86a3-4473fdf5bb6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember_08aa4e96-ee37-4034-9ef8-87ab8cdf5162" 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_1c322346-da6a-41e1-86a3-4473fdf5bb6f" xlink:to="loc_srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember_08aa4e96-ee37-4034-9ef8-87ab8cdf5162" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ConsolidatedStatementofStockholdersEquityParenthetical" xlink:type="simple" xlink:href="ame-20210331.xsd#ConsolidatedStatementofStockholdersEquityParenthetical"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ConsolidatedStatementofStockholdersEquityParenthetical" xlink:type="extended" id="i17db0173dba54200807dcfc7d5bef292_ConsolidatedStatementofStockholdersEquityParenthetical"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/CondensedConsolidatedStatementofCashFlows" xlink:type="simple" xlink:href="ame-20210331.xsd#CondensedConsolidatedStatementofCashFlows"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/CondensedConsolidatedStatementofCashFlows" xlink:type="extended" id="ie4cc8c39e5114125a37a5594fa82f54e_CondensedConsolidatedStatementofCashFlows"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/BasisofPresentation" xlink:type="simple" xlink:href="ame-20210331.xsd#BasisofPresentation"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/BasisofPresentation" xlink:type="extended" id="if5d1a72cbccd48e7a44f6752a4d85757_BasisofPresentation"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RecentAccountingPronouncements" xlink:type="simple" xlink:href="ame-20210331.xsd#RecentAccountingPronouncements"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RecentAccountingPronouncements" xlink:type="extended" id="ibcfa4d9f9bce4818bbb2cf065872a017_RecentAccountingPronouncements"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RecentAccountingPronouncementsPolicies" xlink:type="simple" xlink:href="ame-20210331.xsd#RecentAccountingPronouncementsPolicies"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RecentAccountingPronouncementsPolicies" xlink:type="extended" id="i3904b71ec83c48e098efb4de1ddec7cc_RecentAccountingPronouncementsPolicies"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Revenues" xlink:type="simple" xlink:href="ame-20210331.xsd#Revenues"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Revenues" xlink:type="extended" id="i782a0277cfbe4ac68059a24269246e0f_Revenues"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesTables" xlink:type="simple" xlink:href="ame-20210331.xsd#RevenuesTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesTables" xlink:type="extended" id="i6dbd5ef9e16749fe9a069d877eeaeab0_RevenuesTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesOutstandingContractAssetandLiabilityAccountsDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#RevenuesOutstandingContractAssetandLiabilityAccountsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesOutstandingContractAssetandLiabilityAccountsDetail" xlink:type="extended" id="i43a280f638004f088aa7c0fe4ad9430e_RevenuesOutstandingContractAssetandLiabilityAccountsDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#RevenuesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesAdditionalInformationDetail" xlink:type="extended" id="i81dbc9d60ee64df9b113986d9d1de452_RevenuesAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_839d903b-b976-4467-bbc8-9e7fd32b7405" 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_2f4ac689-d71e-4723-81ab-c82455010f15" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_2f4ac689-d71e-4723-81ab-c82455010f15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_c6c7288a-deaf-4ace-b932-14c1046c40c4" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_c6c7288a-deaf-4ace-b932-14c1046c40c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_208356ed-22fc-4078-a79e-557e04ddd855" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_208356ed-22fc-4078-a79e-557e04ddd855" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_971dadd4-e761-42c5-98b2-a3337c2a09d5" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_971dadd4-e761-42c5-98b2-a3337c2a09d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_5e6dcbf2-c824-4dc7-ab2d-6b5d52c80195" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_ReceivablesNetCurrent_5e6dcbf2-c824-4dc7-ab2d-6b5d52c80195" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForNotesAndLoansReceivableCurrent_23056a74-f4de-492c-a7ab-249caaa2cded" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_AllowanceForNotesAndLoansReceivableCurrent_23056a74-f4de-492c-a7ab-249caaa2cded" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_b1296fbf-d546-4bfa-8345-663a3e0a5a5c" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_b1296fbf-d546-4bfa-8345-663a3e0a5a5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2447a00d-3946-43ba-95ff-8fd2fbdc7389" 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_b1296fbf-d546-4bfa-8345-663a3e0a5a5c" xlink:to="loc_srt_RangeAxis_2447a00d-3946-43ba-95ff-8fd2fbdc7389" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2447a00d-3946-43ba-95ff-8fd2fbdc7389_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_2447a00d-3946-43ba-95ff-8fd2fbdc7389" xlink:to="loc_srt_RangeMember_2447a00d-3946-43ba-95ff-8fd2fbdc7389_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fd0231fa-1146-4489-b422-f822885f3b58" 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_2447a00d-3946-43ba-95ff-8fd2fbdc7389" xlink:to="loc_srt_RangeMember_fd0231fa-1146-4489-b422-f822885f3b58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_61cf8676-f9b8-4086-bd02-67ea246de195" 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_fd0231fa-1146-4489-b422-f822885f3b58" xlink:to="loc_srt_MinimumMember_61cf8676-f9b8-4086-bd02-67ea246de195" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_8bf1064a-deca-4a10-85f4-1e7f1d295856" 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_fd0231fa-1146-4489-b422-f822885f3b58" xlink:to="loc_srt_MaximumMember_8bf1064a-deca-4a10-85f4-1e7f1d295856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c68da339-f739-4b64-bfa6-b144b41833ab" 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_b1296fbf-d546-4bfa-8345-663a3e0a5a5c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c68da339-f739-4b64-bfa6-b144b41833ab" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesAdditionalInformationDetail_1" xlink:type="simple" xlink:href="ame-20210331.xsd#RevenuesAdditionalInformationDetail_1"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesAdditionalInformationDetail_1" xlink:type="extended" id="ic7867012faa9489897faaac3f906aa2a_RevenuesAdditionalInformationDetail_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_839d903b-b976-4467-bbc8-9e7fd32b7405" 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_2f4ac689-d71e-4723-81ab-c82455010f15" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_2f4ac689-d71e-4723-81ab-c82455010f15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_c6c7288a-deaf-4ace-b932-14c1046c40c4" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_c6c7288a-deaf-4ace-b932-14c1046c40c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_208356ed-22fc-4078-a79e-557e04ddd855" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_208356ed-22fc-4078-a79e-557e04ddd855" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_971dadd4-e761-42c5-98b2-a3337c2a09d5" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_971dadd4-e761-42c5-98b2-a3337c2a09d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_5e6dcbf2-c824-4dc7-ab2d-6b5d52c80195" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_ReceivablesNetCurrent_5e6dcbf2-c824-4dc7-ab2d-6b5d52c80195" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForNotesAndLoansReceivableCurrent_23056a74-f4de-492c-a7ab-249caaa2cded" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_AllowanceForNotesAndLoansReceivableCurrent_23056a74-f4de-492c-a7ab-249caaa2cded" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_b1296fbf-d546-4bfa-8345-663a3e0a5a5c" 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_839d903b-b976-4467-bbc8-9e7fd32b7405" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_b1296fbf-d546-4bfa-8345-663a3e0a5a5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2447a00d-3946-43ba-95ff-8fd2fbdc7389" 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_b1296fbf-d546-4bfa-8345-663a3e0a5a5c" xlink:to="loc_srt_RangeAxis_2447a00d-3946-43ba-95ff-8fd2fbdc7389" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2447a00d-3946-43ba-95ff-8fd2fbdc7389_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_2447a00d-3946-43ba-95ff-8fd2fbdc7389" xlink:to="loc_srt_RangeMember_2447a00d-3946-43ba-95ff-8fd2fbdc7389_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fd0231fa-1146-4489-b422-f822885f3b58" 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_2447a00d-3946-43ba-95ff-8fd2fbdc7389" xlink:to="loc_srt_RangeMember_fd0231fa-1146-4489-b422-f822885f3b58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_61cf8676-f9b8-4086-bd02-67ea246de195" 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_fd0231fa-1146-4489-b422-f822885f3b58" xlink:to="loc_srt_MinimumMember_61cf8676-f9b8-4086-bd02-67ea246de195" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_8bf1064a-deca-4a10-85f4-1e7f1d295856" 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_fd0231fa-1146-4489-b422-f822885f3b58" xlink:to="loc_srt_MaximumMember_8bf1064a-deca-4a10-85f4-1e7f1d295856" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesInformationaboutOperationsinDifferentGeographicAreasDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#RevenuesInformationaboutOperationsinDifferentGeographicAreasDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesInformationaboutOperationsinDifferentGeographicAreasDetail" xlink:type="extended" id="id83833ce925543458ca0daf239987abd_RevenuesInformationaboutOperationsinDifferentGeographicAreasDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_5880dc09-928f-4a04-8bcb-5ecc0d725fd2" 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_RevenueFromContractWithCustomerExcludingAssessedTax_e9a0eb46-4db4-4836-be61-4939c1f32359" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5880dc09-928f-4a04-8bcb-5ecc0d725fd2" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e9a0eb46-4db4-4836-be61-4939c1f32359" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_bfb28333-9e4d-44a8-857b-946bc4b097b4" 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_5880dc09-928f-4a04-8bcb-5ecc0d725fd2" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_bfb28333-9e4d-44a8-857b-946bc4b097b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1d508076-6ead-4042-938c-c9460615e3fa" 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_bfb28333-9e4d-44a8-857b-946bc4b097b4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1d508076-6ead-4042-938c-c9460615e3fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1d508076-6ead-4042-938c-c9460615e3fa_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_1d508076-6ead-4042-938c-c9460615e3fa" xlink:to="loc_us-gaap_SegmentDomain_1d508076-6ead-4042-938c-c9460615e3fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8f334e4e-8c83-4684-9cf7-8613433813dc" 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_1d508076-6ead-4042-938c-c9460615e3fa" xlink:to="loc_us-gaap_SegmentDomain_8f334e4e-8c83-4684-9cf7-8613433813dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_95e390a2-06fe-40ca-9ea4-afa838c28488" xlink:href="ame-20210331.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8f334e4e-8c83-4684-9cf7-8613433813dc" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_95e390a2-06fe-40ca-9ea4-afa838c28488" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_ac6ec0ac-b1e3-4960-bea3-86460d01e9ba" xlink:href="ame-20210331.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8f334e4e-8c83-4684-9cf7-8613433813dc" xlink:to="loc_ame_ElectromechanicalGroupMember_ac6ec0ac-b1e3-4960-bea3-86460d01e9ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_5218b0ce-1939-4f47-832d-5594e9521812" 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_bfb28333-9e4d-44a8-857b-946bc4b097b4" xlink:to="loc_srt_StatementGeographicalAxis_5218b0ce-1939-4f47-832d-5594e9521812" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5218b0ce-1939-4f47-832d-5594e9521812_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_5218b0ce-1939-4f47-832d-5594e9521812" xlink:to="loc_srt_SegmentGeographicalDomain_5218b0ce-1939-4f47-832d-5594e9521812_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_b3a14e23-2c68-41c5-b250-64db1f97857f" 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_5218b0ce-1939-4f47-832d-5594e9521812" xlink:to="loc_srt_SegmentGeographicalDomain_b3a14e23-2c68-41c5-b250-64db1f97857f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_a5d7045f-d204-4ca8-a7ec-8ab38fd2c877" 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_b3a14e23-2c68-41c5-b250-64db1f97857f" xlink:to="loc_country_US_a5d7045f-d204-4ca8-a7ec-8ab38fd2c877" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_0c30dbae-606c-4642-8a97-9c69f9fba34c" 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_b3a14e23-2c68-41c5-b250-64db1f97857f" xlink:to="loc_country_GB_0c30dbae-606c-4642-8a97-9c69f9fba34c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EuropeanUnionMember_c924e1fc-e1ca-4485-bfb0-07854b65d92b" 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_b3a14e23-2c68-41c5-b250-64db1f97857f" xlink:to="loc_us-gaap_EuropeanUnionMember_c924e1fc-e1ca-4485-bfb0-07854b65d92b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_90c5cff9-fafa-4c97-bba5-051ed2b50a74" 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_b3a14e23-2c68-41c5-b250-64db1f97857f" xlink:to="loc_srt_AsiaMember_90c5cff9-fafa-4c97-bba5-051ed2b50a74" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_OtherForeignCountriesMember_33afd85c-d371-42a8-b495-9619c0df2e6a" xlink:href="ame-20210331.xsd#ame_OtherForeignCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_b3a14e23-2c68-41c5-b250-64db1f97857f" xlink:to="loc_ame_OtherForeignCountriesMember_33afd85c-d371-42a8-b495-9619c0df2e6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_InternationalMember_d06e6f76-c7d6-4bd1-ba6d-06dd8f20d9f1" xlink:href="ame-20210331.xsd#ame_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_b3a14e23-2c68-41c5-b250-64db1f97857f" xlink:to="loc_ame_InternationalMember_d06e6f76-c7d6-4bd1-ba6d-06dd8f20d9f1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_6067e194-a79f-442e-abeb-29bbdaa1fdad" 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_b3a14e23-2c68-41c5-b250-64db1f97857f" xlink:to="loc_us-gaap_NonUsMember_6067e194-a79f-442e-abeb-29bbdaa1fdad" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesMajorProductsandServicesinReportableSegmentsDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#RevenuesMajorProductsandServicesinReportableSegmentsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesMajorProductsandServicesinReportableSegmentsDetail" xlink:type="extended" id="i32fa13db43924174878269fc1a430255_RevenuesMajorProductsandServicesinReportableSegmentsDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_47d0dab6-4fd5-41fb-891c-e4f921a27df5" 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_RevenueFromContractWithCustomerExcludingAssessedTax_68230929-d65a-4017-aefb-fc415423e14a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_47d0dab6-4fd5-41fb-891c-e4f921a27df5" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_68230929-d65a-4017-aefb-fc415423e14a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_d81cc9e0-62d8-4a34-8a31-a104275a8ad5" 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_47d0dab6-4fd5-41fb-891c-e4f921a27df5" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_d81cc9e0-62d8-4a34-8a31-a104275a8ad5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_158d3a12-022d-4655-bc72-85c30ec4ad01" 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_d81cc9e0-62d8-4a34-8a31-a104275a8ad5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_158d3a12-022d-4655-bc72-85c30ec4ad01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_158d3a12-022d-4655-bc72-85c30ec4ad01_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_158d3a12-022d-4655-bc72-85c30ec4ad01" xlink:to="loc_us-gaap_SegmentDomain_158d3a12-022d-4655-bc72-85c30ec4ad01_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2fc76f78-5f47-4a13-81c0-5033e0834d5e" 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_158d3a12-022d-4655-bc72-85c30ec4ad01" xlink:to="loc_us-gaap_SegmentDomain_2fc76f78-5f47-4a13-81c0-5033e0834d5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_e4a8a3d2-c5b6-41e2-978f-86be9abb83ef" xlink:href="ame-20210331.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_2fc76f78-5f47-4a13-81c0-5033e0834d5e" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_e4a8a3d2-c5b6-41e2-978f-86be9abb83ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_f9feb890-86c8-4d72-80a5-8f14ad7e4237" xlink:href="ame-20210331.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_2fc76f78-5f47-4a13-81c0-5033e0834d5e" xlink:to="loc_ame_ElectromechanicalGroupMember_f9feb890-86c8-4d72-80a5-8f14ad7e4237" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_7f8389fb-ee9b-4fea-9359-85556dafb9c3" 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_d81cc9e0-62d8-4a34-8a31-a104275a8ad5" xlink:to="loc_srt_ProductOrServiceAxis_7f8389fb-ee9b-4fea-9359-85556dafb9c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7f8389fb-ee9b-4fea-9359-85556dafb9c3_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_7f8389fb-ee9b-4fea-9359-85556dafb9c3" xlink:to="loc_srt_ProductsAndServicesDomain_7f8389fb-ee9b-4fea-9359-85556dafb9c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_28da5731-eeab-4769-a7c6-c6114a0e85b5" 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_7f8389fb-ee9b-4fea-9359-85556dafb9c3" xlink:to="loc_srt_ProductsAndServicesDomain_28da5731-eeab-4769-a7c6-c6114a0e85b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ProcessAndAnalyticalInstrumentationMember_5da589c9-a623-4f2a-b324-abed4c1b8eef" xlink:href="ame-20210331.xsd#ame_ProcessAndAnalyticalInstrumentationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_28da5731-eeab-4769-a7c6-c6114a0e85b5" xlink:to="loc_ame_ProcessAndAnalyticalInstrumentationMember_5da589c9-a623-4f2a-b324-abed4c1b8eef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_AerospaceAndPowerMember_0c559927-9c98-4400-8702-b9745de8ee40" xlink:href="ame-20210331.xsd#ame_AerospaceAndPowerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_28da5731-eeab-4769-a7c6-c6114a0e85b5" xlink:to="loc_ame_AerospaceAndPowerMember_0c559927-9c98-4400-8702-b9745de8ee40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_AutomationAndEngineeredSolutionsMember_309d4345-d9f7-4619-8b04-79380c2b6ebb" xlink:href="ame-20210331.xsd#ame_AutomationAndEngineeredSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_28da5731-eeab-4769-a7c6-c6114a0e85b5" xlink:to="loc_ame_AutomationAndEngineeredSolutionsMember_309d4345-d9f7-4619-8b04-79380c2b6ebb" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesTimingofRevenueRecognitionDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#RevenuesTimingofRevenueRecognitionDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesTimingofRevenueRecognitionDetail" xlink:type="extended" id="i96bca42074d64630986f273821622ee9_RevenuesTimingofRevenueRecognitionDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_a122d193-a9a5-4fc1-83c4-cce771b0d5c4" 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_RevenueFromContractWithCustomerExcludingAssessedTax_1c9bf862-0d86-42f7-9e6f-5dc49b39c68a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a122d193-a9a5-4fc1-83c4-cce771b0d5c4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1c9bf862-0d86-42f7-9e6f-5dc49b39c68a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_55037e36-72f1-4695-a349-8df1808a4bd2" 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_a122d193-a9a5-4fc1-83c4-cce771b0d5c4" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_55037e36-72f1-4695-a349-8df1808a4bd2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_fc493371-e448-436f-a013-406e6c315e92" 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_55037e36-72f1-4695-a349-8df1808a4bd2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_fc493371-e448-436f-a013-406e6c315e92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_fc493371-e448-436f-a013-406e6c315e92_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_fc493371-e448-436f-a013-406e6c315e92" xlink:to="loc_us-gaap_SegmentDomain_fc493371-e448-436f-a013-406e6c315e92_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f0293309-9916-4d9c-8b69-2e1fbad5b1e3" 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_fc493371-e448-436f-a013-406e6c315e92" xlink:to="loc_us-gaap_SegmentDomain_f0293309-9916-4d9c-8b69-2e1fbad5b1e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_5d9b7b3f-9ca6-4db0-85d7-0341fcfbb143" xlink:href="ame-20210331.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_f0293309-9916-4d9c-8b69-2e1fbad5b1e3" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_5d9b7b3f-9ca6-4db0-85d7-0341fcfbb143" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_c15a39ce-c3f6-4df6-bd32-2a27490e7cef" xlink:href="ame-20210331.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_f0293309-9916-4d9c-8b69-2e1fbad5b1e3" xlink:to="loc_ame_ElectromechanicalGroupMember_c15a39ce-c3f6-4df6-bd32-2a27490e7cef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_73ff253a-6ef1-4bb0-a097-acf01468f7ec" 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_55037e36-72f1-4695-a349-8df1808a4bd2" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_73ff253a-6ef1-4bb0-a097-acf01468f7ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_73ff253a-6ef1-4bb0-a097-acf01468f7ec_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_73ff253a-6ef1-4bb0-a097-acf01468f7ec" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_73ff253a-6ef1-4bb0-a097-acf01468f7ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_4adbbfb1-4e46-42f2-82e4-537fe0ee37e4" 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_73ff253a-6ef1-4bb0-a097-acf01468f7ec" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_4adbbfb1-4e46-42f2-82e4-537fe0ee37e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_ae86e4db-acb9-4a40-8541-3e2e3e1f08a2" 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_4adbbfb1-4e46-42f2-82e4-537fe0ee37e4" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_ae86e4db-acb9-4a40-8541-3e2e3e1f08a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_d55218e5-4ef0-46a7-9c40-694af0d0afa2" 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_4adbbfb1-4e46-42f2-82e4-537fe0ee37e4" xlink:to="loc_us-gaap_TransferredOverTimeMember_d55218e5-4ef0-46a7-9c40-694af0d0afa2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RevenuesChangesinAccruedProductWarrantyObligationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#RevenuesChangesinAccruedProductWarrantyObligationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RevenuesChangesinAccruedProductWarrantyObligationDetail" xlink:type="extended" id="ib60f1cdf5c974ebf85135b30f370ab22_RevenuesChangesinAccruedProductWarrantyObligationDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/EarningsPerShare" xlink:type="simple" xlink:href="ame-20210331.xsd#EarningsPerShare"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/EarningsPerShare" xlink:type="extended" id="ife3154351f4048e28e390d22c98a5c33_EarningsPerShare"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/EarningsPerShareTables" xlink:type="simple" xlink:href="ame-20210331.xsd#EarningsPerShareTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/EarningsPerShareTables" xlink:type="extended" id="i41a3e0f715744c06982d06a4954d766c_EarningsPerShareTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/EarningsPerShareNumberofWeightedAverageSharesDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#EarningsPerShareNumberofWeightedAverageSharesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/EarningsPerShareNumberofWeightedAverageSharesDetail" xlink:type="extended" id="ife2d45a2347c4c2e800318de328167e2_EarningsPerShareNumberofWeightedAverageSharesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurements" xlink:type="simple" xlink:href="ame-20210331.xsd#FairValueMeasurements"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurements" xlink:type="extended" id="ic3066b8e4b52425bb50d8af62db27035_FairValueMeasurements"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="ame-20210331.xsd#FairValueMeasurementsTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurementsTables" xlink:type="extended" id="icc0bed96b1f74ddc8c3954caba8e6d72_FairValueMeasurementsTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurementsFairValueofAssetsMeasuredonRecurringBasisDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#FairValueMeasurementsFairValueofAssetsMeasuredonRecurringBasisDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurementsFairValueofAssetsMeasuredonRecurringBasisDetail" xlink:type="extended" id="ia4fe28ac4f424b739ab62219e07e4a40_FairValueMeasurementsFairValueofAssetsMeasuredonRecurringBasisDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a8979cad-257a-4e9d-91f6-94c51117d5bd" 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_0b8327c4-7a99-4b33-bced-ee62054605f5" 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_a8979cad-257a-4e9d-91f6-94c51117d5bd" xlink:to="loc_us-gaap_LongTermInvestments_0b8327c4-7a99-4b33-bced-ee62054605f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_822969d2-2685-4050-8aff-8500d747de82" 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_a8979cad-257a-4e9d-91f6-94c51117d5bd" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_822969d2-2685-4050-8aff-8500d747de82" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_98ba74ca-0843-43e9-ac2d-2fcc57ed4b1e" 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_822969d2-2685-4050-8aff-8500d747de82" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_98ba74ca-0843-43e9-ac2d-2fcc57ed4b1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_98ba74ca-0843-43e9-ac2d-2fcc57ed4b1e_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_98ba74ca-0843-43e9-ac2d-2fcc57ed4b1e" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_98ba74ca-0843-43e9-ac2d-2fcc57ed4b1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_51746dbe-caef-4e48-860b-5327a755f86f" 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_98ba74ca-0843-43e9-ac2d-2fcc57ed4b1e" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_51746dbe-caef-4e48-860b-5327a755f86f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_3c577904-c722-4418-b8db-c6e4c561552f" 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_51746dbe-caef-4e48-860b-5327a755f86f" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_3c577904-c722-4418-b8db-c6e4c561552f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurementsAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#FairValueMeasurementsAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurementsAdditionalInformationDetail" xlink:type="extended" id="i8581c2632724449eae56ee507763b462_FairValueMeasurementsAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_e24fdb89-acfe-40bd-9516-e97d84a420ec" 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_61619489-80c0-484a-b5d9-d86405bd35a3" 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_e24fdb89-acfe-40bd-9516-e97d84a420ec" xlink:to="loc_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_61619489-80c0-484a-b5d9-d86405bd35a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_1aebb3ff-371c-4296-ab15-dbf372657164" 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_e24fdb89-acfe-40bd-9516-e97d84a420ec" xlink:to="loc_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_1aebb3ff-371c-4296-ab15-dbf372657164" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_f2b89d4d-9d5f-47a8-a434-b43952b91826" 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_e24fdb89-acfe-40bd-9516-e97d84a420ec" xlink:to="loc_us-gaap_DerivativeNotionalAmount_f2b89d4d-9d5f-47a8-a434-b43952b91826" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_9c1ead28-3fe6-4a76-9239-74a06ccaaf6d" 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_e24fdb89-acfe-40bd-9516-e97d84a420ec" xlink:to="loc_us-gaap_DerivativeTable_9c1ead28-3fe6-4a76-9239-74a06ccaaf6d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_a6e77757-8586-44c8-b4f9-054356442331" 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_9c1ead28-3fe6-4a76-9239-74a06ccaaf6d" xlink:to="loc_us-gaap_FinancialInstrumentAxis_a6e77757-8586-44c8-b4f9-054356442331" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a6e77757-8586-44c8-b4f9-054356442331_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_a6e77757-8586-44c8-b4f9-054356442331" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a6e77757-8586-44c8-b4f9-054356442331_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1bcc0974-1b4f-45b9-a889-33f22887d101" 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_a6e77757-8586-44c8-b4f9-054356442331" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1bcc0974-1b4f-45b9-a889-33f22887d101" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_0501760a-37b4-439e-950c-24baeba94c0d" 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_1bcc0974-1b4f-45b9-a889-33f22887d101" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_0501760a-37b4-439e-950c-24baeba94c0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_BritishPoundDenominatedLoansMember_64adf4e4-8ddf-4d7c-a385-db0a0eaab665" xlink:href="ame-20210331.xsd#ame_BritishPoundDenominatedLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1bcc0974-1b4f-45b9-a889-33f22887d101" xlink:to="loc_ame_BritishPoundDenominatedLoansMember_64adf4e4-8ddf-4d7c-a385-db0a0eaab665" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_1f774a6f-7d44-4927-a526-a43ad7cc1b85" 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_9c1ead28-3fe6-4a76-9239-74a06ccaaf6d" xlink:to="loc_srt_CurrencyAxis_1f774a6f-7d44-4927-a526-a43ad7cc1b85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_1f774a6f-7d44-4927-a526-a43ad7cc1b85_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_1f774a6f-7d44-4927-a526-a43ad7cc1b85" xlink:to="loc_currency_AllCurrenciesDomain_1f774a6f-7d44-4927-a526-a43ad7cc1b85_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_82ce42a5-bfeb-4474-b912-d258f784848c" 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_1f774a6f-7d44-4927-a526-a43ad7cc1b85" xlink:to="loc_currency_AllCurrenciesDomain_82ce42a5-bfeb-4474-b912-d258f784848c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_CAD_06818dd6-f497-444f-9f72-4f278dc645ff" 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_82ce42a5-bfeb-4474-b912-d258f784848c" xlink:to="loc_currency_CAD_06818dd6-f497-444f-9f72-4f278dc645ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_GBP_2010e798-073d-46ca-9c69-c50e0f10789e" 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_82ce42a5-bfeb-4474-b912-d258f784848c" xlink:to="loc_currency_GBP_2010e798-073d-46ca-9c69-c50e0f10789e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/FairValueMeasurementsFairValueDisclosuresofFinancialInstrumentLiabilitiesDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#FairValueMeasurementsFairValueDisclosuresofFinancialInstrumentLiabilitiesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/FairValueMeasurementsFairValueDisclosuresofFinancialInstrumentLiabilitiesDetail" xlink:type="extended" id="id45f381bb49845f29f001e31244b7ca7_FairValueMeasurementsFairValueDisclosuresofFinancialInstrumentLiabilitiesDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_57739fa0-f874-4db7-b2d5-abd8215982e3" 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_7543e9b8-9ca0-4208-8be8-fd9855885fef" 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_57739fa0-f874-4db7-b2d5-abd8215982e3" xlink:to="loc_us-gaap_LongTermDebtFairValue_7543e9b8-9ca0-4208-8be8-fd9855885fef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_1e4104ea-7860-4709-809f-aee1a6e799a0" 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_57739fa0-f874-4db7-b2d5-abd8215982e3" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_1e4104ea-7860-4709-809f-aee1a6e799a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_b711bdbd-f61b-4544-8098-559efc56e892" 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_1e4104ea-7860-4709-809f-aee1a6e799a0" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_b711bdbd-f61b-4544-8098-559efc56e892" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_b711bdbd-f61b-4544-8098-559efc56e892_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_b711bdbd-f61b-4544-8098-559efc56e892" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_b711bdbd-f61b-4544-8098-559efc56e892_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_b9b0c376-ffb5-4a47-bda1-fdb94c506d33" 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_b711bdbd-f61b-4544-8098-559efc56e892" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_b9b0c376-ffb5-4a47-bda1-fdb94c506d33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_72e972f4-8bc9-4ba3-b5bb-288bdd3e5d38" 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_b9b0c376-ffb5-4a47-bda1-fdb94c506d33" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_72e972f4-8bc9-4ba3-b5bb-288bdd3e5d38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_5c7fcbc9-6d57-4829-bde5-0986bc25bc63" 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_72e972f4-8bc9-4ba3-b5bb-288bdd3e5d38" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_5c7fcbc9-6d57-4829-bde5-0986bc25bc63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_33f63733-5127-4971-8ed9-950ba18ce2c9" 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_72e972f4-8bc9-4ba3-b5bb-288bdd3e5d38" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_33f63733-5127-4971-8ed9-950ba18ce2c9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/HedgingActivities" xlink:type="simple" xlink:href="ame-20210331.xsd#HedgingActivities"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/HedgingActivities" xlink:type="extended" id="i62640deee00340bea990a420d73771bf_HedgingActivities"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/HedgingActivitiesAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#HedgingActivitiesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/HedgingActivitiesAdditionalInformationDetail" xlink:type="extended" id="i74bf2ef6938344d3ac333ca67dbb01f0_HedgingActivitiesAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_3e1e7167-19dd-4069-be38-3627e7d7f51a" 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_e6322d75-56c1-46cb-a964-f76c0bd9990c" 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_3e1e7167-19dd-4069-be38-3627e7d7f51a" xlink:to="loc_us-gaap_DerivativeAmountOfHedgedItem_e6322d75-56c1-46cb-a964-f76c0bd9990c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_PercentageOfEffectivenessOnNetInvestmentHedges_991f76db-7944-4f3a-8dfd-a7b97202d639" xlink:href="ame-20210331.xsd#ame_PercentageOfEffectivenessOnNetInvestmentHedges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_3e1e7167-19dd-4069-be38-3627e7d7f51a" xlink:to="loc_ame_PercentageOfEffectivenessOnNetInvestmentHedges_991f76db-7944-4f3a-8dfd-a7b97202d639" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_d15d0ad0-9e58-4dac-ade1-34cf47ad1727" 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_3e1e7167-19dd-4069-be38-3627e7d7f51a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_d15d0ad0-9e58-4dac-ade1-34cf47ad1727" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_bdfcdcb2-4dfd-4945-b679-967933ba555f" 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_3e1e7167-19dd-4069-be38-3627e7d7f51a" xlink:to="loc_us-gaap_DerivativeTable_bdfcdcb2-4dfd-4945-b679-967933ba555f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_f44e4b48-4980-4683-8593-b972c7ff135e" 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_bdfcdcb2-4dfd-4945-b679-967933ba555f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_f44e4b48-4980-4683-8593-b972c7ff135e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f44e4b48-4980-4683-8593-b972c7ff135e_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_f44e4b48-4980-4683-8593-b972c7ff135e" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f44e4b48-4980-4683-8593-b972c7ff135e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_d07f6970-ca16-4095-8854-3a213b50069f" 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_f44e4b48-4980-4683-8593-b972c7ff135e" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_d07f6970-ca16-4095-8854-3a213b50069f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_237433bd-7889-43e6-a286-8ea78d09f4dc" 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_d07f6970-ca16-4095-8854-3a213b50069f" xlink:to="loc_us-gaap_ForeignExchangeContractMember_237433bd-7889-43e6-a286-8ea78d09f4dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_dee6fa52-ab41-470b-9627-1d834b35cad6" 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_bdfcdcb2-4dfd-4945-b679-967933ba555f" xlink:to="loc_us-gaap_HedgingDesignationAxis_dee6fa52-ab41-470b-9627-1d834b35cad6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_dee6fa52-ab41-470b-9627-1d834b35cad6_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_dee6fa52-ab41-470b-9627-1d834b35cad6" xlink:to="loc_us-gaap_HedgingDesignationDomain_dee6fa52-ab41-470b-9627-1d834b35cad6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_f3f57216-1fa5-4ca9-b350-2cda33806b08" 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_dee6fa52-ab41-470b-9627-1d834b35cad6" xlink:to="loc_us-gaap_HedgingDesignationDomain_f3f57216-1fa5-4ca9-b350-2cda33806b08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_eeeb99fd-215f-431c-b860-66d1424098e4" 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_f3f57216-1fa5-4ca9-b350-2cda33806b08" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_eeeb99fd-215f-431c-b860-66d1424098e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_bc33da34-436a-45c6-973b-de6a6d4ad970" 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_bdfcdcb2-4dfd-4945-b679-967933ba555f" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_bc33da34-436a-45c6-973b-de6a6d4ad970" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_bc33da34-436a-45c6-973b-de6a6d4ad970_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_bc33da34-436a-45c6-973b-de6a6d4ad970" xlink:to="loc_us-gaap_HedgingRelationshipDomain_bc33da34-436a-45c6-973b-de6a6d4ad970_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_d1c1e84d-1af7-4c26-90f3-7dcc418821b3" 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_bc33da34-436a-45c6-973b-de6a6d4ad970" xlink:to="loc_us-gaap_HedgingRelationshipDomain_d1c1e84d-1af7-4c26-90f3-7dcc418821b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_BritishPoundDenominatedLoansMember_f5d3fb61-f14e-4023-a6d0-4651daf391b6" xlink:href="ame-20210331.xsd#ame_BritishPoundDenominatedLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_d1c1e84d-1af7-4c26-90f3-7dcc418821b3" xlink:to="loc_ame_BritishPoundDenominatedLoansMember_f5d3fb61-f14e-4023-a6d0-4651daf391b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_EuroLoanMember_5ceae7e4-53e6-4422-b02b-a3615c2544ff" xlink:href="ame-20210331.xsd#ame_EuroLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_d1c1e84d-1af7-4c26-90f3-7dcc418821b3" xlink:to="loc_ame_EuroLoanMember_5ceae7e4-53e6-4422-b02b-a3615c2544ff" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Inventoriesnet" xlink:type="simple" xlink:href="ame-20210331.xsd#Inventoriesnet"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Inventoriesnet" xlink:type="extended" id="i1770ee78682e4f61823f1796260bd273_Inventoriesnet"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/InventoriesnetTables" xlink:type="simple" xlink:href="ame-20210331.xsd#InventoriesnetTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/InventoriesnetTables" xlink:type="extended" id="i71433282cb76499ea45d6dfb4b7829d6_InventoriesnetTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/InventoriesnetInventoriesDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#InventoriesnetInventoriesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/InventoriesnetInventoriesDetail" xlink:type="extended" id="i0fd98935a197408eaba225a6c17a3d1f_InventoriesnetInventoriesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Leases" xlink:type="simple" xlink:href="ame-20210331.xsd#Leases"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Leases" xlink:type="extended" id="i27ae7c8815a8478e9d7714cf4149f924_Leases"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesTables" xlink:type="simple" xlink:href="ame-20210331.xsd#LeasesTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesTables" xlink:type="extended" id="i33338c9abcd948148505955c0066fea9_LeasesTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="ame-20210331.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesAdditionalInformationDetails" xlink:type="extended" id="id824fdf3039f455ca8f02d187108d8ad_LeasesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_1827f283-cd1c-4e48-b0a1-fd026ace1dea" 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_4d6c8ec5-fd8d-4fbd-8711-43c482c856c4" 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_1827f283-cd1c-4e48-b0a1-fd026ace1dea" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_4d6c8ec5-fd8d-4fbd-8711-43c482c856c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_e73c8f38-a48c-48b8-8fc3-78698e25db14" 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_1827f283-cd1c-4e48-b0a1-fd026ace1dea" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_e73c8f38-a48c-48b8-8fc3-78698e25db14" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_25a3cf67-5dd7-48db-9102-239514e67a2d" 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_e73c8f38-a48c-48b8-8fc3-78698e25db14" xlink:to="loc_srt_RangeAxis_25a3cf67-5dd7-48db-9102-239514e67a2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_25a3cf67-5dd7-48db-9102-239514e67a2d_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_25a3cf67-5dd7-48db-9102-239514e67a2d" xlink:to="loc_srt_RangeMember_25a3cf67-5dd7-48db-9102-239514e67a2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9aabe547-1122-4ca4-bd02-1d226ce61110" 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_25a3cf67-5dd7-48db-9102-239514e67a2d" xlink:to="loc_srt_RangeMember_9aabe547-1122-4ca4-bd02-1d226ce61110" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1c6ffb1f-71dc-4f77-86cc-debacd4a4b42" 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_9aabe547-1122-4ca4-bd02-1d226ce61110" xlink:to="loc_srt_MinimumMember_1c6ffb1f-71dc-4f77-86cc-debacd4a4b42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f81456e1-4a5d-4dc4-95c8-2da2b6ce3c93" 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_9aabe547-1122-4ca4-bd02-1d226ce61110" xlink:to="loc_srt_MaximumMember_f81456e1-4a5d-4dc4-95c8-2da2b6ce3c93" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesComponentsofLeaseExpenseDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#LeasesComponentsofLeaseExpenseDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesComponentsofLeaseExpenseDetail" xlink:type="extended" id="id4a435bdc66c4b2a92dfe1cc6d6fc4fe_LeasesComponentsofLeaseExpenseDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesSupplementalBalanceSheetInformationRelatedtoLeasesDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#LeasesSupplementalBalanceSheetInformationRelatedtoLeasesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesSupplementalBalanceSheetInformationRelatedtoLeasesDetail" xlink:type="extended" id="i2f441f062fce435f9044e631a62eecbb_LeasesSupplementalBalanceSheetInformationRelatedtoLeasesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/LeasesMaturitiesofleaseliabilitiesDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#LeasesMaturitiesofleaseliabilitiesDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/LeasesMaturitiesofleaseliabilitiesDetail" xlink:type="extended" id="i09e1a7c022ca47038a6a0339d4b9ab95_LeasesMaturitiesofleaseliabilitiesDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AcquisitionsandDivestiture" xlink:type="simple" xlink:href="ame-20210331.xsd#AcquisitionsandDivestiture"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AcquisitionsandDivestiture" xlink:type="extended" id="i47e4f92bf48449998c62576351741640_AcquisitionsandDivestiture"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AcquisitionsandDivestitureTables" xlink:type="simple" xlink:href="ame-20210331.xsd#AcquisitionsandDivestitureTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AcquisitionsandDivestitureTables" xlink:type="extended" id="if7c0c9ea579f4bd5856c4432f1fd3343_AcquisitionsandDivestitureTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AcquisitionsandDivestitureAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#AcquisitionsandDivestitureAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AcquisitionsandDivestitureAdditionalInformationDetail" xlink:type="extended" id="ib1d4e69c212a4dc4a9b7efa586022819_AcquisitionsandDivestitureAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_8ffe7d63-1f63-400a-a969-ce6c28423a6d" 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_ca9ae64a-f5ce-4cf4-8fae-d3b4b947cad9" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_ca9ae64a-f5ce-4cf4-8fae-d3b4b947cad9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_d1a34901-b397-4057-9d98-58912da056f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_d1a34901-b397-4057-9d98-58912da056f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_66f199df-36cd-4d0f-852c-322523b4dc16" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_66f199df-36cd-4d0f-852c-322523b4dc16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_f53833bf-8111-424a-b84a-0f8a6765f0d5" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_f53833bf-8111-424a-b84a-0f8a6765f0d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_ff35261b-48a7-4df7-8d3e-dc567e67d982" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_ff35261b-48a7-4df7-8d3e-dc567e67d982" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_ee54d443-b29d-4e9d-a12b-5e4a4667c975" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_ee54d443-b29d-4e9d-a12b-5e4a4667c975" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_7ef1b953-36d6-444e-a7d7-088ccdf8a018" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_7ef1b953-36d6-444e-a7d7-088ccdf8a018" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths_15046bfb-5a22-422c-b9a0-002c2f1645f9" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths_15046bfb-5a22-422c-b9a0-002c2f1645f9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo_6382054b-6f35-4c7c-8213-ebd03bf24c79" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo_6382054b-6f35-4c7c-8213-ebd03bf24c79" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree_60bc3585-51f2-4c1c-9ac9-b2f6a5dedff0" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree_60bc3585-51f2-4c1c-9ac9-b2f6a5dedff0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour_c45ce164-513f-484d-9a2d-28fabfeef339" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour_c45ce164-513f-484d-9a2d-28fabfeef339" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive_73766386-f6e6-4369-a2f6-ef2d6a350dca" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive_73766386-f6e6-4369-a2f6-ef2d6a350dca" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_b182c062-4842-46be-b3a3-178a178af2d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_b182c062-4842-46be-b3a3-178a178af2d5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_eaa89584-3538-44d2-b429-27ee6464fb18" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_eaa89584-3538-44d2-b429-27ee6464fb18" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_IncomeTaxExpenseRelatingToSaleOfBusiness_cbfac6bf-6be6-42f2-9c4e-ee13ad33612d" xlink:href="ame-20210331.xsd#ame_IncomeTaxExpenseRelatingToSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_ame_IncomeTaxExpenseRelatingToSaleOfBusiness_cbfac6bf-6be6-42f2-9c4e-ee13ad33612d" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_8f2d10e4-44dc-4227-b4a7-1568819b5896" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_8f2d10e4-44dc-4227-b4a7-1568819b5896" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_BusinessAcquisitionEstimatedAnnualSales_1d3d9059-360d-4733-8ef6-ca159f9698d6" xlink:href="ame-20210331.xsd#ame_BusinessAcquisitionEstimatedAnnualSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_ame_BusinessAcquisitionEstimatedAnnualSales_1d3d9059-360d-4733-8ef6-ca159f9698d6" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8761c4a2-c839-4635-a5dd-608d58cf8e69" 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_8ffe7d63-1f63-400a-a969-ce6c28423a6d" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8761c4a2-c839-4635-a5dd-608d58cf8e69" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_fae25765-c65b-4b30-a706-26a5924936ec" 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_8761c4a2-c839-4635-a5dd-608d58cf8e69" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_fae25765-c65b-4b30-a706-26a5924936ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fae25765-c65b-4b30-a706-26a5924936ec_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_fae25765-c65b-4b30-a706-26a5924936ec" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fae25765-c65b-4b30-a706-26a5924936ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1375490f-752c-440d-9973-829b405606fd" 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_fae25765-c65b-4b30-a706-26a5924936ec" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1375490f-752c-440d-9973-829b405606fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_ee177995-22b2-421a-aae8-2c68fa0115ad" xlink:href="ame-20210331.xsd#ame_TwoThousandAndTwentyConsolidatedAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1375490f-752c-440d-9973-829b405606fd" xlink:to="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_ee177995-22b2-421a-aae8-2c68fa0115ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_NSIMember_849bb3d6-9abe-4895-9508-e95bde504d50" xlink:href="ame-20210331.xsd#ame_NSIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1375490f-752c-440d-9973-829b405606fd" xlink:to="loc_ame_NSIMember_849bb3d6-9abe-4895-9508-e95bde504d50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_AbacoMember_602e347b-20c7-4f6c-aee0-4e06014e9309" xlink:href="ame-20210331.xsd#ame_AbacoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1375490f-752c-440d-9973-829b405606fd" xlink:to="loc_ame_AbacoMember_602e347b-20c7-4f6c-aee0-4e06014e9309" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_KymeraInternationalMember_f27152c1-4b20-4db3-b952-4b10665d7748" xlink:href="ame-20210331.xsd#ame_KymeraInternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1375490f-752c-440d-9973-829b405606fd" xlink:to="loc_ame_KymeraInternationalMember_f27152c1-4b20-4db3-b952-4b10665d7748" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_239a160f-d469-40e4-b6f3-3cc98accee1a" 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_8761c4a2-c839-4635-a5dd-608d58cf8e69" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_239a160f-d469-40e4-b6f3-3cc98accee1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_239a160f-d469-40e4-b6f3-3cc98accee1a_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_239a160f-d469-40e4-b6f3-3cc98accee1a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_239a160f-d469-40e4-b6f3-3cc98accee1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_218d11dc-d651-43c3-a08e-f57d457a364a" 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_239a160f-d469-40e4-b6f3-3cc98accee1a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_218d11dc-d651-43c3-a08e-f57d457a364a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_9f679e38-168a-484b-8f7d-f935303580c2" 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_218d11dc-d651-43c3-a08e-f57d457a364a" xlink:to="loc_us-gaap_TradeNamesMember_9f679e38-168a-484b-8f7d-f935303580c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_2a313db4-938c-4544-9680-096a895d4972" 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_218d11dc-d651-43c3-a08e-f57d457a364a" xlink:to="loc_us-gaap_CustomerRelationshipsMember_2a313db4-938c-4544-9680-096a895d4972" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_PurchasedTechnologyMember_d7ab6aba-ab41-4034-b833-5f02c2683701" xlink:href="ame-20210331.xsd#ame_PurchasedTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_218d11dc-d651-43c3-a08e-f57d457a364a" xlink:to="loc_ame_PurchasedTechnologyMember_d7ab6aba-ab41-4034-b833-5f02c2683701" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_c2ea571e-c72f-4eec-b275-e87e3940b681" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8761c4a2-c839-4635-a5dd-608d58cf8e69" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_c2ea571e-c72f-4eec-b275-e87e3940b681" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_c2ea571e-c72f-4eec-b275-e87e3940b681_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_c2ea571e-c72f-4eec-b275-e87e3940b681" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_c2ea571e-c72f-4eec-b275-e87e3940b681_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a93b8f83-f0ae-4e6b-b7da-14db892a5f9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_c2ea571e-c72f-4eec-b275-e87e3940b681" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a93b8f83-f0ae-4e6b-b7da-14db892a5f9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_c2748db1-66eb-4588-9a12-f3540ccabf32" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_a93b8f83-f0ae-4e6b-b7da-14db892a5f9d" xlink:to="loc_us-gaap_SubsequentEventMember_c2748db1-66eb-4588-9a12-f3540ccabf32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_098354a5-6afb-4dd9-850e-e85b03eb2f62" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8761c4a2-c839-4635-a5dd-608d58cf8e69" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_098354a5-6afb-4dd9-850e-e85b03eb2f62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_098354a5-6afb-4dd9-850e-e85b03eb2f62_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_098354a5-6afb-4dd9-850e-e85b03eb2f62" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_098354a5-6afb-4dd9-850e-e85b03eb2f62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b0f5e6da-5380-4662-b31e-0e7dffaf62f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_098354a5-6afb-4dd9-850e-e85b03eb2f62" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b0f5e6da-5380-4662-b31e-0e7dffaf62f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ReadingAlloysMember_8d4d70c6-8665-4859-9dfe-584cd452892f" xlink:href="ame-20210331.xsd#ame_ReadingAlloysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b0f5e6da-5380-4662-b31e-0e7dffaf62f0" xlink:to="loc_ame_ReadingAlloysMember_8d4d70c6-8665-4859-9dfe-584cd452892f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_ce97caf1-c220-4b5b-ae2e-0994c7ea0aa0" 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_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8761c4a2-c839-4635-a5dd-608d58cf8e69" xlink:to="loc_srt_RangeAxis_ce97caf1-c220-4b5b-ae2e-0994c7ea0aa0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ce97caf1-c220-4b5b-ae2e-0994c7ea0aa0_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_ce97caf1-c220-4b5b-ae2e-0994c7ea0aa0" xlink:to="loc_srt_RangeMember_ce97caf1-c220-4b5b-ae2e-0994c7ea0aa0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4784719a-a784-4154-9d0b-7c5a0f061364" 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_ce97caf1-c220-4b5b-ae2e-0994c7ea0aa0" xlink:to="loc_srt_RangeMember_4784719a-a784-4154-9d0b-7c5a0f061364" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_950aec2b-02fe-45aa-8f03-ffff2a8316c1" 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_4784719a-a784-4154-9d0b-7c5a0f061364" xlink:to="loc_srt_MinimumMember_950aec2b-02fe-45aa-8f03-ffff2a8316c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0dc03878-a6c9-4945-b1c4-b04d42a19913" 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_4784719a-a784-4154-9d0b-7c5a0f061364" xlink:to="loc_srt_MaximumMember_0dc03878-a6c9-4945-b1c4-b04d42a19913" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/AcquisitionsandDivestitureAllocationofAggregatePurchasePriceofAcquiredNetAssetsDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#AcquisitionsandDivestitureAllocationofAggregatePurchasePriceofAcquiredNetAssetsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/AcquisitionsandDivestitureAllocationofAggregatePurchasePriceofAcquiredNetAssetsDetail" xlink:type="extended" id="if29f564da5b0402da46ddc7ee6372962_AcquisitionsandDivestitureAllocationofAggregatePurchasePriceofAcquiredNetAssetsDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_141effc0-c5d3-4aea-9d7c-271524a1a45d" 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_8b008e29-4d8f-40ea-b6ca-15f11a80b2a6" 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_141effc0-c5d3-4aea-9d7c-271524a1a45d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_8b008e29-4d8f-40ea-b6ca-15f11a80b2a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_87b896f5-3ad0-47a2-93dd-056f3e84fbed" 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_141effc0-c5d3-4aea-9d7c-271524a1a45d" xlink:to="loc_us-gaap_Goodwill_87b896f5-3ad0-47a2-93dd-056f3e84fbed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_6bc91d06-babd-4c63-98be-86b0c8d8ea29" 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_141effc0-c5d3-4aea-9d7c-271524a1a45d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_6bc91d06-babd-4c63-98be-86b0c8d8ea29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_BusinessAcquisitionPurchasePriceAllocationNetWorkingCapitalAndOther_d1eca526-b5e0-468e-89e5-2d7d7749a507" xlink:href="ame-20210331.xsd#ame_BusinessAcquisitionPurchasePriceAllocationNetWorkingCapitalAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_141effc0-c5d3-4aea-9d7c-271524a1a45d" xlink:to="loc_ame_BusinessAcquisitionPurchasePriceAllocationNetWorkingCapitalAndOther_d1eca526-b5e0-468e-89e5-2d7d7749a507" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_13c740bf-bf4b-4a64-b493-c2f263fa8bc8" 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_141effc0-c5d3-4aea-9d7c-271524a1a45d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_13c740bf-bf4b-4a64-b493-c2f263fa8bc8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_971e23d0-e4e6-49dd-83da-f3f33ae598af" 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_141effc0-c5d3-4aea-9d7c-271524a1a45d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_971e23d0-e4e6-49dd-83da-f3f33ae598af" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f21b5ad3-e544-4f2f-93df-93d96d326164" 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_141effc0-c5d3-4aea-9d7c-271524a1a45d" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f21b5ad3-e544-4f2f-93df-93d96d326164" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_7d697516-b70e-46cd-9720-f3b16779d6d8" 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_f21b5ad3-e544-4f2f-93df-93d96d326164" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_7d697516-b70e-46cd-9720-f3b16779d6d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d697516-b70e-46cd-9720-f3b16779d6d8_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_7d697516-b70e-46cd-9720-f3b16779d6d8" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d697516-b70e-46cd-9720-f3b16779d6d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a571311c-ff89-4a7c-83b6-3c06994492c7" 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_7d697516-b70e-46cd-9720-f3b16779d6d8" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a571311c-ff89-4a7c-83b6-3c06994492c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_742ef14d-bf8a-4af5-b2c9-ee3256e54171" xlink:href="ame-20210331.xsd#ame_TwoThousandAndTwentyConsolidatedAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a571311c-ff89-4a7c-83b6-3c06994492c7" xlink:to="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_742ef14d-bf8a-4af5-b2c9-ee3256e54171" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Goodwill" xlink:type="simple" xlink:href="ame-20210331.xsd#Goodwill"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Goodwill" xlink:type="extended" id="iee09222dbe5d456792cb744de0b14f37_Goodwill"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/GoodwillTables" xlink:type="simple" xlink:href="ame-20210331.xsd#GoodwillTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/GoodwillTables" xlink:type="extended" id="if440ee6524794533bb79dcf88d209f7d_GoodwillTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/GoodwillChangesinCarryingAmountsofGoodwillbySegmentDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#GoodwillChangesinCarryingAmountsofGoodwillbySegmentDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/GoodwillChangesinCarryingAmountsofGoodwillbySegmentDetail" xlink:type="extended" id="ib95974e2880047979ee5599fd34afffe_GoodwillChangesinCarryingAmountsofGoodwillbySegmentDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_acc0acad-8b8e-4182-acf9-03b59dc321b0" 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_19c46d3e-fb87-4faf-a583-dd9f4cfbae44" 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_acc0acad-8b8e-4182-acf9-03b59dc321b0" xlink:to="loc_us-gaap_GoodwillRollForward_19c46d3e-fb87-4faf-a583-dd9f4cfbae44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_bbe0a86a-f893-4b57-8c7c-2155707afc18" 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_19c46d3e-fb87-4faf-a583-dd9f4cfbae44" xlink:to="loc_us-gaap_Goodwill_bbe0a86a-f893-4b57-8c7c-2155707afc18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_8f23c6d0-9a58-4850-915a-7134c539d883" 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_19c46d3e-fb87-4faf-a583-dd9f4cfbae44" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_8f23c6d0-9a58-4850-915a-7134c539d883" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_8745543e-c98a-402b-bb23-53b4a8ec5dda" 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_19c46d3e-fb87-4faf-a583-dd9f4cfbae44" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_8745543e-c98a-402b-bb23-53b4a8ec5dda" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_93cc0089-6b12-44db-85bd-0a7a0bacec80" 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_19c46d3e-fb87-4faf-a583-dd9f4cfbae44" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_93cc0089-6b12-44db-85bd-0a7a0bacec80" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_788e4ee7-b2f3-4823-a361-72ffe22210a9" 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_8c0e5dbd-24de-4635-bd51-ae31b85abeb9" 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_acc0acad-8b8e-4182-acf9-03b59dc321b0" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_8c0e5dbd-24de-4635-bd51-ae31b85abeb9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_cb3c7a66-224d-4852-8f6f-07323adeeede" 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_8c0e5dbd-24de-4635-bd51-ae31b85abeb9" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_cb3c7a66-224d-4852-8f6f-07323adeeede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cb3c7a66-224d-4852-8f6f-07323adeeede_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_cb3c7a66-224d-4852-8f6f-07323adeeede" xlink:to="loc_us-gaap_SegmentDomain_cb3c7a66-224d-4852-8f6f-07323adeeede_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e49d9d69-a0c6-4b2d-8c21-5a4b57392684" 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_cb3c7a66-224d-4852-8f6f-07323adeeede" xlink:to="loc_us-gaap_SegmentDomain_e49d9d69-a0c6-4b2d-8c21-5a4b57392684" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectronicInstrumentsGroupMember_aed64389-997d-405a-b82a-e707b57e8dd4" xlink:href="ame-20210331.xsd#ame_ElectronicInstrumentsGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e49d9d69-a0c6-4b2d-8c21-5a4b57392684" xlink:to="loc_ame_ElectronicInstrumentsGroupMember_aed64389-997d-405a-b82a-e707b57e8dd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ElectromechanicalGroupMember_12970d3d-f93f-4eeb-b417-fb7de1316660" xlink:href="ame-20210331.xsd#ame_ElectromechanicalGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e49d9d69-a0c6-4b2d-8c21-5a4b57392684" xlink:to="loc_ame_ElectromechanicalGroupMember_12970d3d-f93f-4eeb-b417-fb7de1316660" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/IncomeTaxes" xlink:type="simple" xlink:href="ame-20210331.xsd#IncomeTaxes"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/IncomeTaxes" xlink:type="extended" id="if4aeb51f34af4434bf6b177cdc468f52_IncomeTaxes"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/IncomeTaxesTables" xlink:type="simple" xlink:href="ame-20210331.xsd#IncomeTaxesTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/IncomeTaxesTables" xlink:type="extended" id="ie4a6b08e03b9450cbe3e572b56150e8b_IncomeTaxesTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/IncomeTaxesAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#IncomeTaxesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/IncomeTaxesAdditionalInformationDetail" xlink:type="extended" id="i0bafc30e093d4aa7ac4b768d3bab5a8a_IncomeTaxesAdditionalInformationDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/IncomeTaxesReconciliationofLiabilityforUncertainTaxPositionsDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#IncomeTaxesReconciliationofLiabilityforUncertainTaxPositionsDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/IncomeTaxesReconciliationofLiabilityforUncertainTaxPositionsDetail" xlink:type="extended" id="i23a9644cd4ca4574853ebeae435d4cbe_IncomeTaxesReconciliationofLiabilityforUncertainTaxPositionsDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Debt" xlink:type="simple" xlink:href="ame-20210331.xsd#Debt"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Debt" xlink:type="extended" id="i16ce9fcc94504d2f8b5df8033afdc0fe_Debt"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/DebtDetails" xlink:type="simple" xlink:href="ame-20210331.xsd#DebtDetails"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/DebtDetails" xlink:type="extended" id="ia2af8fe88a5042e7885d2a240f0f5a96_DebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_5af4897b-bc7a-4121-8d3c-c51bc7093b99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_855e202c-2e5c-46e6-9d4e-ab30a0b7f5a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5af4897b-bc7a-4121-8d3c-c51bc7093b99" xlink:to="loc_us-gaap_DebtInstrumentTerm_855e202c-2e5c-46e6-9d4e-ab30a0b7f5a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_5c494c5e-1b51-4e93-9a99-857a6e110431" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5af4897b-bc7a-4121-8d3c-c51bc7093b99" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_5c494c5e-1b51-4e93-9a99-857a6e110431" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_76ff7d69-649c-4e52-bf75-4c36303101f9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5af4897b-bc7a-4121-8d3c-c51bc7093b99" xlink:to="loc_us-gaap_DebtInstrumentTable_76ff7d69-649c-4e52-bf75-4c36303101f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_439297d3-ed4b-4cda-9c04-08a4118a6f83" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_76ff7d69-649c-4e52-bf75-4c36303101f9" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_439297d3-ed4b-4cda-9c04-08a4118a6f83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_439297d3-ed4b-4cda-9c04-08a4118a6f83_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_439297d3-ed4b-4cda-9c04-08a4118a6f83" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_439297d3-ed4b-4cda-9c04-08a4118a6f83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_d77ac4d7-02a2-469a-8328-3251256841a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_439297d3-ed4b-4cda-9c04-08a4118a6f83" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_d77ac4d7-02a2-469a-8328-3251256841a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_bfc41e14-eb0a-409e-8a8d-a4064c0c84f9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d77ac4d7-02a2-469a-8328-3251256841a1" xlink:to="loc_us-gaap_SecuredDebtMember_bfc41e14-eb0a-409e-8a8d-a4064c0c84f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_15eb36e5-501a-44b6-b09d-3a075a74e3bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_76ff7d69-649c-4e52-bf75-4c36303101f9" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_15eb36e5-501a-44b6-b09d-3a075a74e3bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_15eb36e5-501a-44b6-b09d-3a075a74e3bb_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_15eb36e5-501a-44b6-b09d-3a075a74e3bb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_15eb36e5-501a-44b6-b09d-3a075a74e3bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_98274228-556e-4b36-a2fb-dcd890873d9b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_15eb36e5-501a-44b6-b09d-3a075a74e3bb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_98274228-556e-4b36-a2fb-dcd890873d9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_f5297d89-f879-414c-baf1-7075106f4fa2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_98274228-556e-4b36-a2fb-dcd890873d9b" xlink:to="loc_us-gaap_SubsequentEventMember_f5297d89-f879-414c-baf1-7075106f4fa2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensation" xlink:type="simple" xlink:href="ame-20210331.xsd#ShareBasedCompensation"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensation" xlink:type="extended" id="i903a5808ef1b468b98006de62c3869a0_ShareBasedCompensation"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationTables" xlink:type="simple" xlink:href="ame-20210331.xsd#ShareBasedCompensationTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationTables" xlink:type="extended" id="id5c582d79239439499fd7d29d00a20d6_ShareBasedCompensationTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#ShareBasedCompensationAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationAdditionalInformationDetail" xlink:type="extended" id="iafd898a6af5a4c0f90b6b9e57aa89a57_ShareBasedCompensationAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82dfeea8-5630-4f8d-b686-1934a6ed9293" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_d1634d22-0ef8-463f-8cac-6c0a9d78946f" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_d1634d22-0ef8-463f-8cac-6c0a9d78946f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_f4635713-b276-4d89-bef7-90bb94ae82f9" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_f4635713-b276-4d89-bef7-90bb94ae82f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_a8ad67f8-a76a-44e2-9743-0dacbdc2d78f" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_a8ad67f8-a76a-44e2-9743-0dacbdc2d78f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_90ec59c8-9fdf-46cc-851a-c6b4fa3e4198" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_90ec59c8-9fdf-46cc-851a-c6b4fa3e4198" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_3a4e27ed-2728-4cc8-8491-db7d23ff27e5" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_3a4e27ed-2728-4cc8-8491-db7d23ff27e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_4f00476c-6df1-4a93-960b-146e4587d3d9" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_4f00476c-6df1-4a93-960b-146e4587d3d9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_b0bf939a-32e5-43e5-a889-f6b03a4d6e57" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_b0bf939a-32e5-43e5-a889-f6b03a4d6e57" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_428976ba-91da-436d-a649-06180baacd82" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_428976ba-91da-436d-a649-06180baacd82" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_427f77a3-e0b0-4fe3-8be0-fbab7b3701de" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_427f77a3-e0b0-4fe3-8be0-fbab7b3701de" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_d69d4f85-d66f-4b2d-a186-11afb984b42e" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_d69d4f85-d66f-4b2d-a186-11afb984b42e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_d32fac8f-3808-4489-87da-50232e548458" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_d32fac8f-3808-4489-87da-50232e548458" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_5c198904-588c-4a0c-9c51-cfd2b3ac2a29" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_5c198904-588c-4a0c-9c51-cfd2b3ac2a29" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_521abbb4-c5ce-4d8c-87b2-100751b8bd80" 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_82dfeea8-5630-4f8d-b686-1934a6ed9293" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_521abbb4-c5ce-4d8c-87b2-100751b8bd80" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5710de21-c420-4c43-9067-19292bcbf745" 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_521abbb4-c5ce-4d8c-87b2-100751b8bd80" xlink:to="loc_srt_RangeAxis_5710de21-c420-4c43-9067-19292bcbf745" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5710de21-c420-4c43-9067-19292bcbf745_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_5710de21-c420-4c43-9067-19292bcbf745" xlink:to="loc_srt_RangeMember_5710de21-c420-4c43-9067-19292bcbf745_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_31c7801d-c6f6-486d-a450-c97ba6b96577" 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_5710de21-c420-4c43-9067-19292bcbf745" xlink:to="loc_srt_RangeMember_31c7801d-c6f6-486d-a450-c97ba6b96577" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_aef33ecb-0573-43f0-8a8a-7793f8387b6d" 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_31c7801d-c6f6-486d-a450-c97ba6b96577" xlink:to="loc_srt_MinimumMember_aef33ecb-0573-43f0-8a8a-7793f8387b6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0b458e8f-4f1f-4bac-96f3-956b20503711" 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_31c7801d-c6f6-486d-a450-c97ba6b96577" xlink:to="loc_srt_MaximumMember_0b458e8f-4f1f-4bac-96f3-956b20503711" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_a661e7e3-94c9-4ed6-85b4-c09fed6dfdd7" 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_521abbb4-c5ce-4d8c-87b2-100751b8bd80" xlink:to="loc_us-gaap_VestingAxis_a661e7e3-94c9-4ed6-85b4-c09fed6dfdd7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_a661e7e3-94c9-4ed6-85b4-c09fed6dfdd7_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_a661e7e3-94c9-4ed6-85b4-c09fed6dfdd7" xlink:to="loc_us-gaap_VestingDomain_a661e7e3-94c9-4ed6-85b4-c09fed6dfdd7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_8d3a8145-b4d6-4cac-981a-3870285f9466" 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_a661e7e3-94c9-4ed6-85b4-c09fed6dfdd7" xlink:to="loc_us-gaap_VestingDomain_8d3a8145-b4d6-4cac-981a-3870285f9466" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_OfficersAndKeyManagementEmployeesMember_43bc46cf-715a-4e54-afa2-0a0334617ad0" xlink:href="ame-20210331.xsd#ame_OfficersAndKeyManagementEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_8d3a8145-b4d6-4cac-981a-3870285f9466" xlink:to="loc_ame_OfficersAndKeyManagementEmployeesMember_43bc46cf-715a-4e54-afa2-0a0334617ad0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_16b2723f-89ef-4c7b-80ce-20950f503821" 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_521abbb4-c5ce-4d8c-87b2-100751b8bd80" xlink:to="loc_us-gaap_AwardTypeAxis_16b2723f-89ef-4c7b-80ce-20950f503821" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_16b2723f-89ef-4c7b-80ce-20950f503821_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_16b2723f-89ef-4c7b-80ce-20950f503821" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_16b2723f-89ef-4c7b-80ce-20950f503821_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e8ff3f8-f8a2-4120-ac4e-061ca643d07d" 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_16b2723f-89ef-4c7b-80ce-20950f503821" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e8ff3f8-f8a2-4120-ac4e-061ca643d07d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_NonVestedStockOptionsMember_7c2d3321-4b4a-453e-8a63-1938b3f7be57" xlink:href="ame-20210331.xsd#ame_NonVestedStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e8ff3f8-f8a2-4120-ac4e-061ca643d07d" xlink:to="loc_ame_NonVestedStockOptionsMember_7c2d3321-4b4a-453e-8a63-1938b3f7be57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_95ac4004-7a73-4321-ade8-120f495060bd" 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_7e8ff3f8-f8a2-4120-ac4e-061ca643d07d" xlink:to="loc_us-gaap_RestrictedStockMember_95ac4004-7a73-4321-ade8-120f495060bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_PerformanceRestrictedStockUnitsMember_89b7d70e-cf8e-469e-9cf2-b4a73705fee8" xlink:href="ame-20210331.xsd#ame_PerformanceRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7e8ff3f8-f8a2-4120-ac4e-061ca643d07d" xlink:to="loc_ame_PerformanceRestrictedStockUnitsMember_89b7d70e-cf8e-469e-9cf2-b4a73705fee8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationTotalShareBasedCompensationExpenseDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#ShareBasedCompensationTotalShareBasedCompensationExpenseDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationTotalShareBasedCompensationExpenseDetail" xlink:type="extended" id="i18c58bc294e44c8eb81ae8e2ead03868_ShareBasedCompensationTotalShareBasedCompensationExpenseDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationWeightedAverageAssumptionsUsedforEstimatingFairValuesofStockOptionsGrantedDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#ShareBasedCompensationWeightedAverageAssumptionsUsedforEstimatingFairValuesofStockOptionsGrantedDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationWeightedAverageAssumptionsUsedforEstimatingFairValuesofStockOptionsGrantedDetail" xlink:type="extended" id="i0a031ddee8d24a0999c2d2c171b29a29_ShareBasedCompensationWeightedAverageAssumptionsUsedforEstimatingFairValuesofStockOptionsGrantedDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationSummaryofStockOptionActivityandRelatedInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#ShareBasedCompensationSummaryofStockOptionActivityandRelatedInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationSummaryofStockOptionActivityandRelatedInformationDetail" xlink:type="extended" id="ic72187b67085429eb8a73e735e509be8_ShareBasedCompensationSummaryofStockOptionActivityandRelatedInformationDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ShareBasedCompensationSummaryofNonvestedRestrictedStockActivityandRelatedInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#ShareBasedCompensationSummaryofNonvestedRestrictedStockActivityandRelatedInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ShareBasedCompensationSummaryofNonvestedRestrictedStockActivityandRelatedInformationDetail" xlink:type="extended" id="ie100822d79114013b85451a27be5ec01_ShareBasedCompensationSummaryofNonvestedRestrictedStockActivityandRelatedInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_70895153-3d85-4549-8e1a-8fca28ebdd0e" 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_0a1f0411-b743-4509-a8da-307d742a7795" 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_70895153-3d85-4549-8e1a-8fca28ebdd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0a1f0411-b743-4509-a8da-307d742a7795" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_764624e5-b91d-4200-b500-cde0bcff1f89" 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_0a1f0411-b743-4509-a8da-307d742a7795" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_764624e5-b91d-4200-b500-cde0bcff1f89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_e3b650b6-7596-4f2b-874e-4eeef3471bbd" 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_0a1f0411-b743-4509-a8da-307d742a7795" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_e3b650b6-7596-4f2b-874e-4eeef3471bbd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAssumptionChange_31b6987a-fa15-4743-b7bf-4bbecb124ec2" xlink:href="ame-20210331.xsd#ame_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAssumptionChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0a1f0411-b743-4509-a8da-307d742a7795" xlink:to="loc_ame_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAssumptionChange_31b6987a-fa15-4743-b7bf-4bbecb124ec2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_5774a58d-b654-46cc-b560-96aff18a70dd" 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_0a1f0411-b743-4509-a8da-307d742a7795" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_5774a58d-b654-46cc-b560-96aff18a70dd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6611fb24-0209-45e2-822d-1d32790ac70a" 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_0a1f0411-b743-4509-a8da-307d742a7795" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6611fb24-0209-45e2-822d-1d32790ac70a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_bf2bfa03-df86-4a18-a033-30283e16b64d" 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_7496c91d-ce04-4a08-90ef-c5e3c05bf435" 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_70895153-3d85-4549-8e1a-8fca28ebdd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7496c91d-ce04-4a08-90ef-c5e3c05bf435" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_006bdbb0-740c-4555-869e-faa85b8fe468" 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_7496c91d-ce04-4a08-90ef-c5e3c05bf435" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_006bdbb0-740c-4555-869e-faa85b8fe468" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_033eff98-0b82-4985-b9f0-604676db8120" 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_7496c91d-ce04-4a08-90ef-c5e3c05bf435" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_033eff98-0b82-4985-b9f0-604676db8120" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAssumptionChangeWeightedAverageGrantDateFairValue_570f53cd-42c7-4761-b87f-e2556d26476e" xlink:href="ame-20210331.xsd#ame_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAssumptionChangeWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7496c91d-ce04-4a08-90ef-c5e3c05bf435" xlink:to="loc_ame_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAssumptionChangeWeightedAverageGrantDateFairValue_570f53cd-42c7-4761-b87f-e2556d26476e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_fd9af1d1-57e9-434e-9999-90b96561584c" 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_7496c91d-ce04-4a08-90ef-c5e3c05bf435" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_fd9af1d1-57e9-434e-9999-90b96561584c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_88f46214-a102-4017-ac5c-56f3db4d333e" 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_7496c91d-ce04-4a08-90ef-c5e3c05bf435" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_88f46214-a102-4017-ac5c-56f3db4d333e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3bd7f1c2-694a-40db-9c0c-38618464c4d6" 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_a1d7ffcd-aa2b-4089-b95a-0feb6d1cb6da" 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_70895153-3d85-4549-8e1a-8fca28ebdd0e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a1d7ffcd-aa2b-4089-b95a-0feb6d1cb6da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_281b66e5-9583-4f5e-a565-3eee96c12925" 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_a1d7ffcd-aa2b-4089-b95a-0feb6d1cb6da" xlink:to="loc_us-gaap_AwardTypeAxis_281b66e5-9583-4f5e-a565-3eee96c12925" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_281b66e5-9583-4f5e-a565-3eee96c12925_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_281b66e5-9583-4f5e-a565-3eee96c12925" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_281b66e5-9583-4f5e-a565-3eee96c12925_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_50523f58-19b4-49e6-bc17-76e7985327b2" 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_281b66e5-9583-4f5e-a565-3eee96c12925" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_50523f58-19b4-49e6-bc17-76e7985327b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_52dbe60a-dfc3-4bec-8fa5-f6879da13a0c" 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_50523f58-19b4-49e6-bc17-76e7985327b2" xlink:to="loc_us-gaap_RestrictedStockMember_52dbe60a-dfc3-4bec-8fa5-f6879da13a0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_PerformanceRestrictedStockUnitsMember_8014f6bc-7a34-4b7c-9738-31ffb6180268" xlink:href="ame-20210331.xsd#ame_PerformanceRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_50523f58-19b4-49e6-bc17-76e7985327b2" xlink:to="loc_ame_PerformanceRestrictedStockUnitsMember_8014f6bc-7a34-4b7c-9738-31ffb6180268" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RetirementandPensionPlans" xlink:type="simple" xlink:href="ame-20210331.xsd#RetirementandPensionPlans"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RetirementandPensionPlans" xlink:type="extended" id="ida3899ee67b6478a9025ec651af1f971_RetirementandPensionPlans"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RetirementandPensionPlansTables" xlink:type="simple" xlink:href="ame-20210331.xsd#RetirementandPensionPlansTables"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RetirementandPensionPlansTables" xlink:type="extended" id="i51a7d59e00df4ba4bd6268303d0e01e2_RetirementandPensionPlansTables"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RetirementandPensionPlansComponentsofNetPeriodicPensionBenefitExpenseIncomeDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#RetirementandPensionPlansComponentsofNetPeriodicPensionBenefitExpenseIncomeDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RetirementandPensionPlansComponentsofNetPeriodicPensionBenefitExpenseIncomeDetail" xlink:type="extended" id="i51452f2c38fd4934a1fe4f2e1e2c9057_RetirementandPensionPlansComponentsofNetPeriodicPensionBenefitExpenseIncomeDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/RetirementandPensionPlansAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#RetirementandPensionPlansAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/RetirementandPensionPlansAdditionalInformationDetail" xlink:type="extended" id="if95ddc8fc4004f7e9152fbae9d9ebe7c_RetirementandPensionPlansAdditionalInformationDetail"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/Contingencies" xlink:type="simple" xlink:href="ame-20210331.xsd#Contingencies"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/Contingencies" xlink:type="extended" id="i2748e729b120407d931856809d67fea3_Contingencies"/>
  <link:roleRef roleURI="http://www.amtexinc.com/role/ContingenciesAdditionalInformationDetail" xlink:type="simple" xlink:href="ame-20210331.xsd#ContingenciesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.amtexinc.com/role/ContingenciesAdditionalInformationDetail" xlink:type="extended" id="i030da9fecabf4dd19fc5c324b3a09020_ContingenciesAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SiteContingencyLineItems_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" 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_16ff2475-a1a7-4d46-9a19-3b39c495dbd4" xlink:href="ame-20210331.xsd#ame_LossContingencyNumberOfNonOwnedSitesCompanyIsNamedPotentiallyResponsibleParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsNamedPotentiallyResponsibleParty_16ff2475-a1a7-4d46-9a19-3b39c495dbd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsIdentifiedAsDeMinimisParty_cb9dcdb1-f59d-47b2-8a59-b627a4d538fe" xlink:href="ame-20210331.xsd#ame_LossContingencyNumberOfNonOwnedSitesCompanyIsIdentifiedAsDeMinimisParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsIdentifiedAsDeMinimisParty_cb9dcdb1-f59d-47b2-8a59-b627a4d538fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsInAgreementOnAmountOfDeMinimisSettlement_aabb91be-0b7f-425e-ba38-e89c0c01fbef" xlink:href="ame-20210331.xsd#ame_LossContingencyNumberOfNonOwnedSitesCompanyIsInAgreementOnAmountOfDeMinimisSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsInAgreementOnAmountOfDeMinimisSettlement_aabb91be-0b7f-425e-ba38-e89c0c01fbef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsContinuingToInvestigate_4c1d7dfc-8c7c-490a-9870-ae286f66673e" xlink:href="ame-20210331.xsd#ame_LossContingencyNumberOfNonOwnedSitesCompanyIsContinuingToInvestigate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_ame_LossContingencyNumberOfNonOwnedSitesCompanyIsContinuingToInvestigate_4c1d7dfc-8c7c-490a-9870-ae286f66673e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingencies_a662c862-acf0-46af-9618-49a0a913ab3c" 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_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingencies_a662c862-acf0-46af-9618-49a0a913ab3c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationExpense_bedf17b8-a17e-42c7-80d0-f45dcea57424" 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_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_us-gaap_EnvironmentalRemediationExpense_bedf17b8-a17e-42c7-80d0-f45dcea57424" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForEnvironmentalLiabilities_ee2bd161-f1b8-46f3-862b-9e16e48bfe08" 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_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_us-gaap_PaymentsForEnvironmentalLiabilities_ee2bd161-f1b8-46f3-862b-9e16e48bfe08" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingenciesComponentAmount_283befbb-4e87-4866-a14f-64c794bb7f1d" 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_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingenciesComponentAmount_283befbb-4e87-4866-a14f-64c794bb7f1d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_46f518ad-3f50-4c14-9c9c-43d19aad2a54" 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_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_46f518ad-3f50-4c14-9c9c-43d19aad2a54" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SiteContingencyTable_0034bf0f-4bf3-4045-9d41-3bc968af745b" 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_fb3b10c4-aee4-4bd9-b94b-74e82bec1481" xlink:to="loc_us-gaap_SiteContingencyTable_0034bf0f-4bf3-4045-9d41-3bc968af745b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteAxis_0b5192fa-27aa-417f-b9db-fac0dac7015e" 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_0034bf0f-4bf3-4045-9d41-3bc968af745b" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteAxis_0b5192fa-27aa-417f-b9db-fac0dac7015e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_0b5192fa-27aa-417f-b9db-fac0dac7015e_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_0b5192fa-27aa-417f-b9db-fac0dac7015e" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_0b5192fa-27aa-417f-b9db-fac0dac7015e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_52a958d9-4991-4ed0-bb9a-449c1737e43b" 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_0b5192fa-27aa-417f-b9db-fac0dac7015e" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_52a958d9-4991-4ed0-bb9a-449c1737e43b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_HccMember_b0554a97-e1f7-4da8-b550-6118a52c5b2f" xlink:href="ame-20210331.xsd#ame_HccMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_52a958d9-4991-4ed0-bb9a-449c1737e43b" xlink:to="loc_ame_HccMember_b0554a97-e1f7-4da8-b550-6118a52c5b2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_ed11fd2a-a3d4-46de-9c70-edbdec5a67b3" 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_SiteContingencyTable_0034bf0f-4bf3-4045-9d41-3bc968af745b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_ed11fd2a-a3d4-46de-9c70-edbdec5a67b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ed11fd2a-a3d4-46de-9c70-edbdec5a67b3_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_ed11fd2a-a3d4-46de-9c70-edbdec5a67b3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ed11fd2a-a3d4-46de-9c70-edbdec5a67b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5d1b92a4-f022-44a9-8c13-4b6420edf87b" 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_ed11fd2a-a3d4-46de-9c70-edbdec5a67b3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5d1b92a4-f022-44a9-8c13-4b6420edf87b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_3b189996-54f2-4631-9a17-8d609ec14cb3" xlink:href="ame-20210331.xsd#ame_TwoThousandAndTwentyConsolidatedAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5d1b92a4-f022-44a9-8c13-4b6420edf87b" xlink:to="loc_ame_TwoThousandAndTwentyConsolidatedAcquisitionMember_3b189996-54f2-4631-9a17-8d609ec14cb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b4baabc2-a35f-48bf-8765-fe6dce231835" 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_SiteContingencyTable_0034bf0f-4bf3-4045-9d41-3bc968af745b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b4baabc2-a35f-48bf-8765-fe6dce231835" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b4baabc2-a35f-48bf-8765-fe6dce231835_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_b4baabc2-a35f-48bf-8765-fe6dce231835" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b4baabc2-a35f-48bf-8765-fe6dce231835_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_051c6b81-dd43-4874-9455-0c0725b88309" 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_b4baabc2-a35f-48bf-8765-fe6dce231835" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_051c6b81-dd43-4874-9455-0c0725b88309" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_8cbe7269-aacf-456a-9a91-69e0afc682d0" 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_051c6b81-dd43-4874-9455-0c0725b88309" xlink:to="loc_us-gaap_CustomerRelationshipsMember_8cbe7269-aacf-456a-9a91-69e0afc682d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_1be75784-98d8-481f-bca6-e14657bbefc8" 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_SiteContingencyTable_0034bf0f-4bf3-4045-9d41-3bc968af745b" xlink:to="loc_srt_RangeAxis_1be75784-98d8-481f-bca6-e14657bbefc8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1be75784-98d8-481f-bca6-e14657bbefc8_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_1be75784-98d8-481f-bca6-e14657bbefc8" xlink:to="loc_srt_RangeMember_1be75784-98d8-481f-bca6-e14657bbefc8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_351e5fa5-f986-476a-8799-b723f6ebb2d7" 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_1be75784-98d8-481f-bca6-e14657bbefc8" xlink:to="loc_srt_RangeMember_351e5fa5-f986-476a-8799-b723f6ebb2d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_02014bdd-d7b6-4224-87d5-4019c0b36904" 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_351e5fa5-f986-476a-8799-b723f6ebb2d7" xlink:to="loc_srt_MaximumMember_02014bdd-d7b6-4224-87d5-4019c0b36904" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_8576c185-42c4-4faa-90bf-0d231376e16c" 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_351e5fa5-f986-476a-8799-b723f6ebb2d7" xlink:to="loc_srt_MinimumMember_8576c185-42c4-4faa-90bf-0d231376e16c" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
