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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019dfe77-38cd-711d-941c-9cc4fb85c9f6,g:376936be-26a3-49da-8412-00bcab32ebf9-->
<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.revvity.com/role/CoverPage" xlink:type="simple" xlink:href="revv-20260405.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsLineItems_019dfe77-3b04-7e11-a07e-a101752ee8d8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityListingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsTable_019dfe77-3b04-7484-85ed-54e6427bbba9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityListingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityListingsLineItems_019dfe77-3b04-7e11-a07e-a101752ee8d8" xlink:to="loc_dei_EntityListingsTable_019dfe77-3b04-7484-85ed-54e6427bbba9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsExchangeAxis_019dfe77-3b04-7c49-abe7-b1017549544e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityListingsExchangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityListingsTable_019dfe77-3b04-7484-85ed-54e6427bbba9" xlink:to="loc_dei_EntityListingsExchangeAxis_019dfe77-3b04-7c49-abe7-b1017549544e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_019dfe77-3b04-7c49-abe7-b1017549544e_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityListingsExchangeAxis_019dfe77-3b04-7c49-abe7-b1017549544e" xlink:to="loc_dei_ExchangeDomain_019dfe77-3b04-7c49-abe7-b1017549544e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_019dfe77-3b04-740a-8ffd-336965723045" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityListingsExchangeAxis_019dfe77-3b04-7c49-abe7-b1017549544e" xlink:to="loc_dei_ExchangeDomain_019dfe77-3b04-740a-8ffd-336965723045" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XNYS_019dfe77-3b04-765d-853d-4f1fa73f5f0b" xlink:href="https://xbrl.sec.gov/exch/2026/exch-2026.xsd#exch_XNYS"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_019dfe77-3b04-740a-8ffd-336965723045" xlink:to="loc_exch_XNYS_019dfe77-3b04-765d-853d-4f1fa73f5f0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019dfe77-3b04-7e3f-a882-982f20cc1e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityListingsTable_019dfe77-3b04-7484-85ed-54e6427bbba9" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019dfe77-3b04-7e3f-a882-982f20cc1e2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019dfe77-3b04-7e3f-a882-982f20cc1e2d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019dfe77-3b04-7e3f-a882-982f20cc1e2d" xlink:to="loc_us-gaap_ClassOfStockDomain_019dfe77-3b04-7e3f-a882-982f20cc1e2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019dfe77-3b04-70b0-8f3b-b5e482c8d323" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019dfe77-3b04-7e3f-a882-982f20cc1e2d" xlink:to="loc_us-gaap_ClassOfStockDomain_019dfe77-3b04-70b0-8f3b-b5e482c8d323" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_Commonstock1parvaluepershareMember_019dfe77-3b04-790f-a7ea-08b3891909b0" xlink:href="revv-20260405.xsd#revv_Commonstock1parvaluepershareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019dfe77-3b04-70b0-8f3b-b5e482c8d323" xlink:to="loc_revv_Commonstock1parvaluepershareMember_019dfe77-3b04-790f-a7ea-08b3891909b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A1.875Notesdue2026Member_019dfe77-3b04-7b3d-8d09-d318eb17cd91" xlink:href="revv-20260405.xsd#revv_A1.875Notesdue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019dfe77-3b04-70b0-8f3b-b5e482c8d323" xlink:to="loc_revv_A1.875Notesdue2026Member_019dfe77-3b04-7b3d-8d09-d318eb17cd91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TradingSymbolAxis_019dfe77-3b04-7cd7-a071-a57b36334c2d" xlink:href="revv-20260405.xsd#revv_TradingSymbolAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityListingsTable_019dfe77-3b04-7484-85ed-54e6427bbba9" xlink:to="loc_revv_TradingSymbolAxis_019dfe77-3b04-7cd7-a071-a57b36334c2d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TradingSymbolDomain_019dfe77-3b04-7cd7-a071-a57b36334c2d_default" xlink:href="revv-20260405.xsd#revv_TradingSymbolDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_TradingSymbolAxis_019dfe77-3b04-7cd7-a071-a57b36334c2d" xlink:to="loc_revv_TradingSymbolDomain_019dfe77-3b04-7cd7-a071-a57b36334c2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TradingSymbolDomain_019dfe77-3b04-7ea0-a220-ae892fbad5c3" xlink:href="revv-20260405.xsd#revv_TradingSymbolDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_TradingSymbolAxis_019dfe77-3b04-7cd7-a071-a57b36334c2d" xlink:to="loc_revv_TradingSymbolDomain_019dfe77-3b04-7ea0-a220-ae892fbad5c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RVTYMember_019dfe77-3b04-76ef-9c92-94fdab326cfc" xlink:href="revv-20260405.xsd#revv_RVTYMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_TradingSymbolDomain_019dfe77-3b04-7ea0-a220-ae892fbad5c3" xlink:to="loc_revv_RVTYMember_019dfe77-3b04-76ef-9c92-94fdab326cfc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RVTY21AMember_019dfe77-3b04-76e6-9426-6e35ba44caa9" xlink:href="revv-20260405.xsd#revv_RVTY21AMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_TradingSymbolDomain_019dfe77-3b04-7ea0-a220-ae892fbad5c3" xlink:to="loc_revv_RVTY21AMember_019dfe77-3b04-76e6-9426-6e35ba44caa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019dfe77-3b04-71ec-bf92-904bfdf1aa37" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019dfe77-3b04-7e11-a07e-a101752ee8d8" xlink:to="loc_dei_Security12bTitle_019dfe77-3b04-71ec-bf92-904bfdf1aa37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019dfe77-3b04-783f-8a95-4e4a8ad28049" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019dfe77-3b04-7e11-a07e-a101752ee8d8" xlink:to="loc_dei_TradingSymbol_019dfe77-3b04-783f-8a95-4e4a8ad28049" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019dfe77-3b04-701a-9dc7-11a40e6a967f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019dfe77-3b04-7e11-a07e-a101752ee8d8" xlink:to="loc_dei_SecurityExchangeName_019dfe77-3b04-701a-9dc7-11a40e6a967f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/CondensedConsolidatedIncomeStatements" xlink:type="simple" xlink:href="revv-20260405.xsd#CondensedConsolidatedIncomeStatements"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/CondensedConsolidatedIncomeStatements" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019dfe77-3b04-7f86-b345-15156503600c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_StatementTable_019dfe77-3b04-7f86-b345-15156503600c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019dfe77-3b04-7edf-8212-915ef170751e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7f86-b345-15156503600c" xlink:to="loc_srt_StatementScenarioAxis_019dfe77-3b04-7edf-8212-915ef170751e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7edf-8212-915ef170751e_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-7edf-8212-915ef170751e" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7edf-8212-915ef170751e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7eec-88c2-eed24abe4d0d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-7edf-8212-915ef170751e" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7eec-88c2-eed24abe4d0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019dfe77-3b04-7f8a-84f4-9b3e0fe26081" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7f86-b345-15156503600c" xlink:to="loc_srt_ProductOrServiceAxis_019dfe77-3b04-7f8a-84f4-9b3e0fe26081" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019dfe77-3b04-7f8a-84f4-9b3e0fe26081_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019dfe77-3b04-7f8a-84f4-9b3e0fe26081" xlink:to="loc_srt_ProductsAndServicesDomain_019dfe77-3b04-7f8a-84f4-9b3e0fe26081_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019dfe77-3b04-7ade-ad23-7ee56f3bac79" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019dfe77-3b04-7f8a-84f4-9b3e0fe26081" xlink:to="loc_srt_ProductsAndServicesDomain_019dfe77-3b04-7ade-ad23-7ee56f3bac79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_019dfe77-3b04-7db6-89e3-b51c8a494148" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019dfe77-3b04-7ade-ad23-7ee56f3bac79" xlink:to="loc_us-gaap_ProductMember_019dfe77-3b04-7db6-89e3-b51c8a494148" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_019dfe77-3b04-79ba-96fb-c0f3b9d92f53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019dfe77-3b04-7ade-ad23-7ee56f3bac79" xlink:to="loc_us-gaap_ServiceMember_019dfe77-3b04-79ba-96fb-c0f3b9d92f53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dfe77-3b04-7521-999f-a1bc5062ba0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dfe77-3b04-7521-999f-a1bc5062ba0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019dfe77-3b04-762d-aa8e-19ff2510b598" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019dfe77-3b04-762d-aa8e-19ff2510b598" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019dfe77-3b04-7c47-8ebc-1145717c8874" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019dfe77-3b04-7c47-8ebc-1145717c8874" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019dfe77-3b04-787d-8d98-60a41536f793" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019dfe77-3b04-787d-8d98-60a41536f793" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019dfe77-3b04-71cb-a7e8-0e156ead2568" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_OperatingIncomeLoss_019dfe77-3b04-71cb-a7e8-0e156ead2568" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_InterestAndOtherExpenseNet_019dfe77-3b04-74f1-ab0d-a205dc1a5fa9" xlink:href="revv-20260405.xsd#revv_InterestAndOtherExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_revv_InterestAndOtherExpenseNet_019dfe77-3b04-74f1-ab0d-a205dc1a5fa9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019dfe77-3b04-7927-bce5-ccc09a1f17ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019dfe77-3b04-7927-bce5-ccc09a1f17ea" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019dfe77-3b04-7eb3-af6a-23db26c32e69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019dfe77-3b04-7eb3-af6a-23db26c32e69" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_019dfe77-3b04-7d6f-80de-73f226aa1025" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_019dfe77-3b04-7d6f-80de-73f226aa1025" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_019dfe77-3b04-74bd-87a5-0239d3454c35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_019dfe77-3b04-74bd-87a5-0239d3454c35" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019dfe77-3b04-74f3-879a-f22f52c58d61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_NetIncomeLoss_019dfe77-3b04-74f3-879a-f22f52c58d61" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_019dfe77-3b04-751c-a38d-983e6a4ec68b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_019dfe77-3b04-751c-a38d-983e6a4ec68b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_019dfe77-3b04-7c12-bbef-93a79420cef6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_019dfe77-3b04-751c-a38d-983e6a4ec68b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_019dfe77-3b04-7c12-bbef-93a79420cef6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_019dfe77-3b04-7c70-a358-905b6080fa07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_019dfe77-3b04-751c-a38d-983e6a4ec68b" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_019dfe77-3b04-7c70-a358-905b6080fa07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019dfe77-3b04-7984-bc1d-f4edc26b3a20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_019dfe77-3b04-751c-a38d-983e6a4ec68b" xlink:to="loc_us-gaap_EarningsPerShareBasic_019dfe77-3b04-7984-bc1d-f4edc26b3a20" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_019dfe77-3b04-7b0b-b1f2-cf8854c46fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_019dfe77-3b04-7b0b-b1f2-cf8854c46fb2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_019dfe77-3b04-7a3e-a5c5-65411590ef3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_019dfe77-3b04-7b0b-b1f2-cf8854c46fb2" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_019dfe77-3b04-7a3e-a5c5-65411590ef3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_019dfe77-3b04-791d-b43e-186270578c12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_019dfe77-3b04-7b0b-b1f2-cf8854c46fb2" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_019dfe77-3b04-791d-b43e-186270578c12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019dfe77-3b04-728d-be00-ec581987b681" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_019dfe77-3b04-7b0b-b1f2-cf8854c46fb2" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019dfe77-3b04-728d-be00-ec581987b681" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019dfe77-3b04-7b9e-bdaf-4f6018d3c424" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7fb9-b7e6-cd20d227521f" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019dfe77-3b04-7b9e-bdaf-4f6018d3c424" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019dfe77-3b04-7b50-a451-d3fe4ac3e5a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019dfe77-3b04-7b9e-bdaf-4f6018d3c424" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019dfe77-3b04-7b50-a451-d3fe4ac3e5a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019dfe77-3b04-703d-9579-cdee80c8f96e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019dfe77-3b04-7b9e-bdaf-4f6018d3c424" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019dfe77-3b04-703d-9579-cdee80c8f96e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019dfe77-3b04-7beb-a2bf-fd272de860a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019dfe77-3b04-7b9e-bdaf-4f6018d3c424" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019dfe77-3b04-7beb-a2bf-fd272de860a6" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/ConsolidatedStatementsofStockholdersEquity" xlink:type="simple" xlink:href="revv-20260405.xsd#ConsolidatedStatementsofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/ConsolidatedStatementsofStockholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019dfe77-3b04-7309-92c8-b0420587c2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_StatementTable_019dfe77-3b04-7309-92c8-b0420587c2bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019dfe77-3b04-7a9b-9462-e0a6464ae881" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7309-92c8-b0420587c2bc" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019dfe77-3b04-7a9b-9462-e0a6464ae881" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-7a9b-9462-e0a6464ae881_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019dfe77-3b04-7a9b-9462-e0a6464ae881" xlink:to="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-7a9b-9462-e0a6464ae881_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-73fa-9656-66f809b7c787" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019dfe77-3b04-7a9b-9462-e0a6464ae881" xlink:to="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-73fa-9656-66f809b7c787" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019dfe77-3b04-7139-8298-224234e4a8f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-73fa-9656-66f809b7c787" xlink:to="loc_us-gaap_CommonStockMember_019dfe77-3b04-7139-8298-224234e4a8f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019dfe77-3b04-7a26-9b8b-b2344f619712" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-73fa-9656-66f809b7c787" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019dfe77-3b04-7a26-9b8b-b2344f619712" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019dfe77-3b04-78ff-bb8e-82f87ce4d3b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-73fa-9656-66f809b7c787" xlink:to="loc_us-gaap_RetainedEarningsMember_019dfe77-3b04-78ff-bb8e-82f87ce4d3b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019dfe77-3b04-7751-aa2b-6ab99c246358" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-73fa-9656-66f809b7c787" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019dfe77-3b04-7751-aa2b-6ab99c246358" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_019dfe77-3b04-7253-a1aa-93225ec43550" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7309-92c8-b0420587c2bc" xlink:to="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_019dfe77-3b04-7253-a1aa-93225ec43550" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInAccountingPrincipleMember_019dfe77-3b04-7253-a1aa-93225ec43550_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInAccountingPrincipleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_019dfe77-3b04-7253-a1aa-93225ec43550" xlink:to="loc_us-gaap_ChangeInAccountingPrincipleMember_019dfe77-3b04-7253-a1aa-93225ec43550_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInAccountingPrincipleMember_019dfe77-3b04-7041-b3ef-cb096567c203" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInAccountingPrincipleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_019dfe77-3b04-7253-a1aa-93225ec43550" xlink:to="loc_us-gaap_ChangeInAccountingPrincipleMember_019dfe77-3b04-7041-b3ef-cb096567c203" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_019dfe77-3b04-723f-80eb-c29280287ba6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7309-92c8-b0420587c2bc" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_019dfe77-3b04-723f-80eb-c29280287ba6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_019dfe77-3b04-723f-80eb-c29280287ba6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_019dfe77-3b04-723f-80eb-c29280287ba6" xlink:to="loc_us-gaap_TypeOfAdoptionMember_019dfe77-3b04-723f-80eb-c29280287ba6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_019dfe77-3b04-7fca-94ff-ded2bbc80c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_019dfe77-3b04-723f-80eb-c29280287ba6" xlink:to="loc_us-gaap_TypeOfAdoptionMember_019dfe77-3b04-7fca-94ff-ded2bbc80c1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CommonStockSharesOutstandingComponentsAxis_019dfe77-3b04-76df-8b3d-26908673bf93" xlink:href="revv-20260405.xsd#revv_CommonStockSharesOutstandingComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7309-92c8-b0420587c2bc" xlink:to="loc_revv_CommonStockSharesOutstandingComponentsAxis_019dfe77-3b04-76df-8b3d-26908673bf93" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-76df-8b3d-26908673bf93_default" xlink:href="revv-20260405.xsd#revv_CommonStockSharesOutstandingComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsAxis_019dfe77-3b04-76df-8b3d-26908673bf93" xlink:to="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-76df-8b3d-26908673bf93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:href="revv-20260405.xsd#revv_CommonStockSharesOutstandingComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsAxis_019dfe77-3b04-76df-8b3d-26908673bf93" xlink:to="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NetIncomeMember_019dfe77-3b04-7961-abad-b097d1bc8ede" xlink:href="revv-20260405.xsd#revv_NetIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_NetIncomeMember_019dfe77-3b04-7961-abad-b097d1bc8ede" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherComprehensiveLossMember_019dfe77-3b04-7b16-b0d8-c7487b7afd09" xlink:href="revv-20260405.xsd#revv_OtherComprehensiveLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_OtherComprehensiveLossMember_019dfe77-3b04-7b16-b0d8-c7487b7afd09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DividendsMember_019dfe77-3b04-7375-b8cc-43b861537c14" xlink:href="revv-20260405.xsd#revv_DividendsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_DividendsMember_019dfe77-3b04-7375-b8cc-43b861537c14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_IssuanceOfCommonStockForBusinessCombinationNetOfIssuanceCostsMember_019dfe77-3b04-7393-8018-906aeb33a862" xlink:href="revv-20260405.xsd#revv_IssuanceOfCommonStockForBusinessCombinationNetOfIssuanceCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_IssuanceOfCommonStockForBusinessCombinationNetOfIssuanceCostsMember_019dfe77-3b04-7393-8018-906aeb33a862" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ExerciseOfEmployeeStockOptionsAndRelatedIncomeTaxBenefitsMember_019dfe77-3b04-7513-9a34-200addb9edcc" xlink:href="revv-20260405.xsd#revv_ExerciseOfEmployeeStockOptionsAndRelatedIncomeTaxBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_ExerciseOfEmployeeStockOptionsAndRelatedIncomeTaxBenefitsMember_019dfe77-3b04-7513-9a34-200addb9edcc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PurchasesOfCommonStockMember_019dfe77-3b04-7974-87bd-0a6a7d553598" xlink:href="revv-20260405.xsd#revv_PurchasesOfCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_PurchasesOfCommonStockMember_019dfe77-3b04-7974-87bd-0a6a7d553598" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_IssuanceOfCommonStockForEmployeeStockPurchasePlansMember_019dfe77-3b04-7ddb-ac5f-bd09ca9bcf25" xlink:href="revv-20260405.xsd#revv_IssuanceOfCommonStockForEmployeeStockPurchasePlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_IssuanceOfCommonStockForEmployeeStockPurchasePlansMember_019dfe77-3b04-7ddb-ac5f-bd09ca9bcf25" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_IssuanceOfCommonStockForLongTermIncentiveProgramMember_019dfe77-3b04-7780-afb0-cded92aec9eb" xlink:href="revv-20260405.xsd#revv_IssuanceOfCommonStockForLongTermIncentiveProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_IssuanceOfCommonStockForLongTermIncentiveProgramMember_019dfe77-3b04-7780-afb0-cded92aec9eb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_StockCompensationMember_019dfe77-3b04-769d-b003-e5445f67c93a" xlink:href="revv-20260405.xsd#revv_StockCompensationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_CommonStockSharesOutstandingComponentsDomain_019dfe77-3b04-715b-b696-cf2c36b48f4c" xlink:to="loc_revv_StockCompensationMember_019dfe77-3b04-769d-b003-e5445f67c93a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019dfe77-3b04-780e-add7-176799ed1d35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_StockholdersEquity_019dfe77-3b04-780e-add7-176799ed1d35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019dfe77-3b04-7342-9b4b-8faeb3c3d9f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_NetIncomeLoss_019dfe77-3b04-7342-9b4b-8faeb3c3d9f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019dfe77-3b04-77ae-8d24-39844e8d4a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019dfe77-3b04-77ae-8d24-39844e8d4a4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Dividends_019dfe77-3b04-7c26-b727-5da4e9505c8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Dividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_Dividends_019dfe77-3b04-7c26-b727-5da4e9505c8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019dfe77-3b04-700c-8757-93640d677e63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019dfe77-3b04-700c-8757-93640d677e63" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019dfe77-3b04-7bb8-9568-9a227b88f337" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019dfe77-3b04-7bb8-9568-9a227b88f337" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_StockIssuedDuringPeriodValueStockOptionsExercisedAndRelatedIncomeTaxBenefit_019dfe77-3b04-72db-a86c-0e01b846c881" xlink:href="revv-20260405.xsd#revv_StockIssuedDuringPeriodValueStockOptionsExercisedAndRelatedIncomeTaxBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_revv_StockIssuedDuringPeriodValueStockOptionsExercisedAndRelatedIncomeTaxBenefit_019dfe77-3b04-72db-a86c-0e01b846c881" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_019dfe77-3b04-72dc-ba6b-86794ca01804" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_019dfe77-3b04-72dc-ba6b-86794ca01804" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CostOfRepurchasedCommonSharesRepurchasePlanAndAmountForStatutoryTaxWithholdingObligations_019dfe77-3b04-716b-b4ea-9e4425516eb7" xlink:href="revv-20260405.xsd#revv_CostOfRepurchasedCommonSharesRepurchasePlanAndAmountForStatutoryTaxWithholdingObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_revv_CostOfRepurchasedCommonSharesRepurchasePlanAndAmountForStatutoryTaxWithholdingObligations_019dfe77-3b04-716b-b4ea-9e4425516eb7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_IssuanceOfCommonStockForLongTermIncentiveProgram_019dfe77-3b04-7619-8bcd-77bb918a16b9" xlink:href="revv-20260405.xsd#revv_IssuanceOfCommonStockForLongTermIncentiveProgram"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_revv_IssuanceOfCommonStockForLongTermIncentiveProgram_019dfe77-3b04-7619-8bcd-77bb918a16b9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019dfe77-3b04-776d-9df1-47f0f3f93a6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019dfe77-3b04-776d-9df1-47f0f3f93a6f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019dfe77-3b04-7493-8a49-9d0ef9d37042" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CumulativeEffectOfNewAccountingPronouncementInPeriodOfAdoption_019dfe77-3b04-7065-8923-4f707e7395b6" xlink:href="revv-20260405.xsd#revv_CumulativeEffectOfNewAccountingPronouncementInPeriodOfAdoption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_revv_CumulativeEffectOfNewAccountingPronouncementInPeriodOfAdoption_019dfe77-3b04-7065-8923-4f707e7395b6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019dfe77-3b04-7780-b28c-b1cc3d9f1cde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019dfe77-3b04-7780-b28c-b1cc3d9f1cde" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherComprehensiveIncomeLossafterReclassificationsNetofTax_019dfe77-3b04-78d5-b7a1-e7fe256fbd4e" xlink:href="revv-20260405.xsd#revv_OtherComprehensiveIncomeLossafterReclassificationsNetofTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_revv_OtherComprehensiveIncomeLossafterReclassificationsNetofTax_019dfe77-3b04-78d5-b7a1-e7fe256fbd4e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019dfe77-3b04-7dba-9fe8-08b4fd7705e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-75a9-81b1-16aad7834003" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019dfe77-3b04-7dba-9fe8-08b4fd7705e9" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/CondensedConsolidatedStatementsofComprehensiveIncome" xlink:type="simple" xlink:href="revv-20260405.xsd#CondensedConsolidatedStatementsofComprehensiveIncome"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/CondensedConsolidatedStatementsofComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019dfe77-3b04-7e41-ba80-b91949677974" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019dfe77-3b04-75bd-a124-d5ad25e68948" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7e41-ba80-b91949677974" xlink:to="loc_us-gaap_StatementTable_019dfe77-3b04-75bd-a124-d5ad25e68948" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019dfe77-3b04-77f9-af02-eb0b9cf2b6a3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-75bd-a124-d5ad25e68948" xlink:to="loc_srt_StatementScenarioAxis_019dfe77-3b04-77f9-af02-eb0b9cf2b6a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-77f9-af02-eb0b9cf2b6a3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-77f9-af02-eb0b9cf2b6a3" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-77f9-af02-eb0b9cf2b6a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7fba-baa4-98a5f53aa647" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-77f9-af02-eb0b9cf2b6a3" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7fba-baa4-98a5f53aa647" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019dfe77-3b04-7f93-ba86-1c5e9083f939" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7e41-ba80-b91949677974" xlink:to="loc_us-gaap_NetIncomeLoss_019dfe77-3b04-7f93-ba86-1c5e9083f939" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7e41-ba80-b91949677974" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ForeignCurrencyTranslationAdjustmentsNetOfIncomeTaxesRecognizedInOtherComprehensiveIncome_019dfe77-3b04-7af1-91d0-63e0e738b32b" xlink:href="revv-20260405.xsd#revv_ForeignCurrencyTranslationAdjustmentsNetOfIncomeTaxesRecognizedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:to="loc_revv_ForeignCurrencyTranslationAdjustmentsNetOfIncomeTaxesRecognizedInOtherComprehensiveIncome_019dfe77-3b04-7af1-91d0-63e0e738b32b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ForeignCurrencyTranslationAdjustmentsNetOfIncomeTaxesReclassifiedToEarnings_019dfe77-3b04-7fc4-b5d6-c1ffb9415143" xlink:href="revv-20260405.xsd#revv_ForeignCurrencyTranslationAdjustmentsNetOfIncomeTaxesReclassifiedToEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:to="loc_revv_ForeignCurrencyTranslationAdjustmentsNetOfIncomeTaxesReclassifiedToEarnings_019dfe77-3b04-7fc4-b5d6-c1ffb9415143" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_019dfe77-3b04-7cb3-99b2-b59f3f897dfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_019dfe77-3b04-7cb3-99b2-b59f3f897dfd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_UnrecognizedPriorServiceCreditsNetOfIncomeTaxes_019dfe77-3b04-77bc-978b-c515fa2d3272" xlink:href="revv-20260405.xsd#revv_UnrecognizedPriorServiceCreditsNetOfIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:to="loc_revv_UnrecognizedPriorServiceCreditsNetOfIncomeTaxes_019dfe77-3b04-77bc-978b-c515fa2d3272" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_019dfe77-3b04-7a24-a428-7c58e949d54a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_019dfe77-3b04-7a24-a428-7c58e949d54a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019dfe77-3b04-720b-9ed4-472f49fdf492" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019dfe77-3b04-720b-9ed4-472f49fdf492" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_019dfe77-3b04-78df-bf07-5ca046fa76e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_019dfe77-3b04-752b-ad72-8b9216d0ad1e" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_019dfe77-3b04-78df-bf07-5ca046fa76e7" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/CondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="revv-20260405.xsd#CondensedConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019dfe77-3b04-7d45-9b2a-7172f3f1d446" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_StatementTable_019dfe77-3b04-7d45-9b2a-7172f3f1d446" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019dfe77-3b04-7421-bf18-3a86670648b7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7d45-9b2a-7172f3f1d446" xlink:to="loc_srt_StatementScenarioAxis_019dfe77-3b04-7421-bf18-3a86670648b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7421-bf18-3a86670648b7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-7421-bf18-3a86670648b7" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7421-bf18-3a86670648b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7aa8-8c0a-f4a0d4e76010" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-7421-bf18-3a86670648b7" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7aa8-8c0a-f4a0d4e76010" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3b04-712f-afb1-afae35eec5b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7d45-9b2a-7172f3f1d446" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3b04-712f-afb1-afae35eec5b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3b04-712f-afb1-afae35eec5b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3b04-712f-afb1-afae35eec5b2" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3b04-712f-afb1-afae35eec5b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3b04-7e9e-bab6-124855c161d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3b04-712f-afb1-afae35eec5b2" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3b04-7e9e-bab6-124855c161d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019dfe77-3b04-7d71-b727-9158b0039cad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019dfe77-3b04-7d71-b727-9158b0039cad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesCurrent_019dfe77-3b04-73d1-b9bb-e689448cdd72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:to="loc_us-gaap_MarketableSecuritiesCurrent_019dfe77-3b04-73d1-b9bb-e689448cdd72" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019dfe77-3b04-7d23-9e4b-264bf490d903" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019dfe77-3b04-7d23-9e4b-264bf490d903" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019dfe77-3b04-75b2-a663-4e8c9416f424" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:to="loc_us-gaap_InventoryNet_019dfe77-3b04-75b2-a663-4e8c9416f424" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_019dfe77-3b04-7ea0-a9ed-a37ec72240b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:to="loc_us-gaap_OtherAssetsCurrent_019dfe77-3b04-7ea0-a9ed-a37ec72240b1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_019dfe77-3b04-7d2d-a73f-91a76b3f7bed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_019dfe77-3b04-7d2d-a73f-91a76b3f7bed" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019dfe77-3b04-7de3-9c87-c8be8c95c384" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019dfe77-3b04-77fc-b2a1-6e172bd1d29d" xlink:to="loc_us-gaap_AssetsCurrent_019dfe77-3b04-7de3-9c87-c8be8c95c384" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_019dfe77-3b04-7c3d-92da-3ae903c7959f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_019dfe77-3b04-7c3d-92da-3ae903c7959f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_019dfe77-3b04-7c93-a50c-ea1dac7859e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAbstract_019dfe77-3b04-7c93-a50c-ea1dac7859e2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019dfe77-3b04-743a-9dcc-ae251c8ebefe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_019dfe77-3b04-7c93-a50c-ea1dac7859e2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019dfe77-3b04-743a-9dcc-ae251c8ebefe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019dfe77-3b04-76ae-864f-e4a560de6cf3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_019dfe77-3b04-7c93-a50c-ea1dac7859e2" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019dfe77-3b04-76ae-864f-e4a560de6cf3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019dfe77-3b04-7a54-b2d9-4a0bc3018170" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_019dfe77-3b04-7c93-a50c-ea1dac7859e2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019dfe77-3b04-7a54-b2d9-4a0bc3018170" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019dfe77-3b04-7e4a-a09c-bdd1dec640da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019dfe77-3b04-7e4a-a09c-bdd1dec640da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermInvestments_019dfe77-3b04-7721-9596-0d36185992fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_LongTermInvestments_019dfe77-3b04-7721-9596-0d36185992fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019dfe77-3b04-7a7a-ad6f-07af401436b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019dfe77-3b04-7a7a-ad6f-07af401436b8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019dfe77-3b04-7681-99fe-8f675348751f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_Goodwill_019dfe77-3b04-7681-99fe-8f675348751f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019dfe77-3b04-7e6f-be18-d23bdff82217" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019dfe77-3b04-7e6f-be18-d23bdff82217" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_019dfe77-3b04-7ade-b641-5b9b294f2bc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_019dfe77-3b04-7ade-b641-5b9b294f2bc5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019dfe77-3b04-7840-8a15-c8b5632ee21e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_Assets_019dfe77-3b04-7840-8a15-c8b5632ee21e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-719a-b0ed-8e3953939b48" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_019dfe77-3b04-729a-9e9e-c0fbef9cee0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_019dfe77-3b04-729a-9e9e-c0fbef9cee0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019dfe77-3b04-7501-a962-a28de23e09a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019dfe77-3b04-729a-9e9e-c0fbef9cee0b" xlink:to="loc_us-gaap_LongTermDebtCurrent_019dfe77-3b04-7501-a962-a28de23e09a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019dfe77-3b04-7e3d-8d3c-a78431555b33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019dfe77-3b04-729a-9e9e-c0fbef9cee0b" xlink:to="loc_us-gaap_AccountsPayableCurrent_019dfe77-3b04-7e3d-8d3c-a78431555b33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveCurrent_019dfe77-3b04-730e-bae3-8fefbad7d253" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019dfe77-3b04-729a-9e9e-c0fbef9cee0b" xlink:to="loc_us-gaap_RestructuringReserveCurrent_019dfe77-3b04-730e-bae3-8fefbad7d253" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_019dfe77-3b04-710a-a427-4c3795a199f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019dfe77-3b04-729a-9e9e-c0fbef9cee0b" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_019dfe77-3b04-710a-a427-4c3795a199f3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_019dfe77-3b04-7307-8541-7b4437959169" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019dfe77-3b04-729a-9e9e-c0fbef9cee0b" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_019dfe77-3b04-7307-8541-7b4437959169" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019dfe77-3b04-769b-9577-082d1c60b002" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019dfe77-3b04-729a-9e9e-c0fbef9cee0b" xlink:to="loc_us-gaap_LiabilitiesCurrent_019dfe77-3b04-769b-9577-082d1c60b002" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019dfe77-3b04-73ff-806b-98cb13895dff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019dfe77-3b04-73ff-806b-98cb13895dff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019dfe77-3b04-7c34-b4ba-c9645ccec35e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019dfe77-3b04-7c34-b4ba-c9645ccec35e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019dfe77-3b04-7b0f-b4bd-9ff971fbe9fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019dfe77-3b04-7b0f-b4bd-9ff971fbe9fc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_019dfe77-3b04-71b6-969a-d39f4de48c8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_019dfe77-3b04-71b6-969a-d39f4de48c8a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019dfe77-3b04-70c4-8999-e4ca3994b29a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_Liabilities_019dfe77-3b04-70c4-8999-e4ca3994b29a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019dfe77-3b04-78f6-be60-9a724f1a7065" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019dfe77-3b04-78f6-be60-9a724f1a7065" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019dfe77-3b04-748c-b482-62aff78673dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019dfe77-3b04-748c-b482-62aff78673dc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_019dfe77-3b04-72a4-bc43-9776c58d6301" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019dfe77-3b04-748c-b482-62aff78673dc" xlink:to="loc_us-gaap_StockholdersEquityAbstract_019dfe77-3b04-72a4-bc43-9776c58d6301" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019dfe77-3b04-7b1c-9b1b-dd0815f7b193" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019dfe77-3b04-72a4-bc43-9776c58d6301" xlink:to="loc_us-gaap_PreferredStockValue_019dfe77-3b04-7b1c-9b1b-dd0815f7b193" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019dfe77-3b04-7e05-9729-d384050cc515" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019dfe77-3b04-72a4-bc43-9776c58d6301" xlink:to="loc_us-gaap_CommonStockValue_019dfe77-3b04-7e05-9729-d384050cc515" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019dfe77-3b04-7ef8-a5a3-c02483f53a53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019dfe77-3b04-72a4-bc43-9776c58d6301" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019dfe77-3b04-7ef8-a5a3-c02483f53a53" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019dfe77-3b04-7415-a918-911302b82604" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019dfe77-3b04-72a4-bc43-9776c58d6301" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019dfe77-3b04-7415-a918-911302b82604" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019dfe77-3b04-7a43-982b-c0d84cacbdb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019dfe77-3b04-72a4-bc43-9776c58d6301" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019dfe77-3b04-7a43-982b-c0d84cacbdb1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019dfe77-3b04-75fb-9f49-9cd60379986e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019dfe77-3b04-72a4-bc43-9776c58d6301" xlink:to="loc_us-gaap_StockholdersEquity_019dfe77-3b04-75fb-9f49-9cd60379986e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019dfe77-3b04-7bd8-8351-cc463067d9e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019dfe77-3b04-7ee7-a75a-63b7eca763ff" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019dfe77-3b04-7bd8-8351-cc463067d9e2" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="revv-20260405.xsd#CondensedConsolidatedStatementsofCashFlows"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019dfe77-3b04-7c2c-b595-66ec3923739f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_StatementTable_019dfe77-3b04-7c2c-b595-66ec3923739f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019dfe77-3b04-7a4c-a007-608ece7a8fb5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7c2c-b595-66ec3923739f" xlink:to="loc_srt_StatementScenarioAxis_019dfe77-3b04-7a4c-a007-608ece7a8fb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7a4c-a007-608ece7a8fb5_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-7a4c-a007-608ece7a8fb5" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7a4c-a007-608ece7a8fb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7905-a28a-940f5c6c6828" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-7a4c-a007-608ece7a8fb5" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-7905-a28a-940f5c6c6828" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019dfe77-3b04-797b-b740-463a6a7c4467" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dfe77-3b04-7c2c-b595-66ec3923739f" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019dfe77-3b04-797b-b740-463a6a7c4467" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-797b-b740-463a6a7c4467_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019dfe77-3b04-797b-b740-463a6a7c4467" xlink:to="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-797b-b740-463a6a7c4467_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-7030-9106-ad23ea883a72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019dfe77-3b04-797b-b740-463a6a7c4467" xlink:to="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-7030-9106-ad23ea883a72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019dfe77-3b04-78a4-8aff-6d3005c2fbfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019dfe77-3b04-7030-9106-ad23ea883a72" xlink:to="loc_us-gaap_CommonStockMember_019dfe77-3b04-78a4-8aff-6d3005c2fbfd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019dfe77-3b04-7c89-b7a7-43884cd0af0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:to="loc_us-gaap_NetIncomeLoss_019dfe77-3b04-7c89-b7a7-43884cd0af0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_019dfe77-3b04-7d0d-867b-2d8803ebdb87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_019dfe77-3b04-7d0d-867b-2d8803ebdb87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_019dfe77-3b04-7839-bc06-53b284f79a60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_019dfe77-3b04-7839-bc06-53b284f79a60" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RestructuringAndOtherCosts_019dfe77-3b04-722e-bda3-3089c71936e9" xlink:href="revv-20260405.xsd#revv_RestructuringAndOtherCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_revv_RestructuringAndOtherCosts_019dfe77-3b04-722e-bda3-3089c71936e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019dfe77-3b04-72fa-8697-be9457a615b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019dfe77-3b04-72fa-8697-be9457a615b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_019dfe77-3b04-7e43-9302-ea0aeb61c49a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_019dfe77-3b04-7e43-9302-ea0aeb61c49a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019dfe77-3b04-7928-bd47-ffee249a068f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019dfe77-3b04-7928-bd47-ffee249a068f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019dfe77-3b04-766f-a587-f89cac378fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_ShareBasedCompensation_019dfe77-3b04-766f-a587-f89cac378fe1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_019dfe77-3b04-7758-939b-36a618f9c640" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_019dfe77-3b04-7758-939b-36a618f9c640" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019dfe77-3b04-773e-85bc-156e58a05dac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019dfe77-3b04-773e-85bc-156e58a05dac" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ChangeInFairValueOfFinancialSecurities_019dfe77-3b04-7125-9927-6ae01458cfcc" xlink:href="revv-20260405.xsd#revv_ChangeInFairValueOfFinancialSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_revv_ChangeInFairValueOfFinancialSecurities_019dfe77-3b04-7125-9927-6ae01458cfcc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_019dfe77-3b04-7553-8e63-aab76ea6d3a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_AssetImpairmentCharges_019dfe77-3b04-7553-8e63-aab76ea6d3a8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AmortizationOfAcquiredInventoryRevaluation_019dfe77-3b04-7d88-ab1f-948c58791d0d" xlink:href="revv-20260405.xsd#revv_AmortizationOfAcquiredInventoryRevaluation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_revv_AmortizationOfAcquiredInventoryRevaluation_019dfe77-3b04-7d88-ab1f-948c58791d0d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_019dfe77-3b04-76ec-8f47-01e4f61c6229" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_019dfe77-3b04-76ec-8f47-01e4f61c6229" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019dfe77-3b04-7f5d-ada0-54295cdb2c64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019dfe77-3b04-7971-9d32-930988e60109" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019dfe77-3b04-7f5d-ada0-54295cdb2c64" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019dfe77-3b04-75ab-bd47-40cedd14409f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019dfe77-3b04-7f5d-ada0-54295cdb2c64" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019dfe77-3b04-75ab-bd47-40cedd14409f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_019dfe77-3b04-7479-a336-028774ab369f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019dfe77-3b04-7f5d-ada0-54295cdb2c64" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_019dfe77-3b04-7479-a336-028774ab369f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019dfe77-3b04-72dd-aaf3-72acd7f33321" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019dfe77-3b04-7f5d-ada0-54295cdb2c64" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019dfe77-3b04-72dd-aaf3-72acd7f33321" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AccruedExpensesAndOther_019dfe77-3b04-76c2-99b4-983e286e1e0c" xlink:href="revv-20260405.xsd#revv_AccruedExpensesAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019dfe77-3b04-7f5d-ada0-54295cdb2c64" xlink:to="loc_revv_AccruedExpensesAndOther_019dfe77-3b04-76c2-99b4-983e286e1e0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_019dfe77-3b04-7cfd-8052-2893969b823a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019dfe77-3b04-7f5d-ada0-54295cdb2c64" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_019dfe77-3b04-7cfd-8052-2893969b823a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_019dfe77-3b04-73bc-9444-3d6e581915c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_019dfe77-3b04-73bc-9444-3d6e581915c4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_019dfe77-3b04-7493-934d-a9283dc4da4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_019dfe77-3b04-7493-934d-a9283dc4da4a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019dfe77-3b04-7a77-b2d9-3bde065e10ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019dfe77-3b04-71e7-8635-29de17d85829" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019dfe77-3b04-7a77-b2d9-3bde065e10ee" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019dfe77-3b04-7309-b20a-b46dfaf54931" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019dfe77-3b04-7309-b20a-b46dfaf54931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PurchasesOfInvestmentsAndNotesReceivables_019dfe77-3b04-7fbc-a074-d2c1d8fe183c" xlink:href="revv-20260405.xsd#revv_PurchasesOfInvestmentsAndNotesReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_revv_PurchasesOfInvestmentsAndNotesReceivables_019dfe77-3b04-7fbc-a074-d2c1d8fe183c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ProceedsFromInvestmentsAndNotesReceivables_019dfe77-3b04-7966-83a5-72c61fb1f3b6" xlink:href="revv-20260405.xsd#revv_ProceedsFromInvestmentsAndNotesReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_revv_ProceedsFromInvestmentsAndNotesReceivables_019dfe77-3b04-7966-83a5-72c61fb1f3b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireMarketableSecurities_019dfe77-3b04-7b0e-bb5d-ed13b540b8d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireMarketableSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_PaymentsToAcquireMarketableSecurities_019dfe77-3b04-7b0e-bb5d-ed13b540b8d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_019dfe77-3b04-7359-bec2-6ee757a1241b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_019dfe77-3b04-7359-bec2-6ee757a1241b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_019dfe77-3b04-760a-b0e6-f7d95dc2b313" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_019dfe77-3b04-760a-b0e6-f7d95dc2b313" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_019dfe77-3b04-7bff-b6bc-c5c580845f8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_019dfe77-3b04-7bff-b6bc-c5c580845f8e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_019dfe77-3b04-76e2-b02c-ce64099ffd1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_019dfe77-3b04-76e2-b02c-ce64099ffd1b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PaymentsForAcquisitionsAndInvestmentsNetOfCashAndCashEquivalentsAcquired_019dfe77-3b04-782f-b819-8f3046830c95" xlink:href="revv-20260405.xsd#revv_PaymentsForAcquisitionsAndInvestmentsNetOfCashAndCashEquivalentsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_revv_PaymentsForAcquisitionsAndInvestmentsNetOfCashAndCashEquivalentsAcquired_019dfe77-3b04-782f-b819-8f3046830c95" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_019dfe77-3b04-7fce-8809-aa9ddcf86bf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_019dfe77-3b04-7fce-8809-aa9ddcf86bf5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_019dfe77-3b04-7ca0-93b7-d151cc682211" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_019dfe77-3b04-7ca0-93b7-d151cc682211" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019dfe77-3b04-7ff2-ad86-0f26b9eda506" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019dfe77-3b04-7640-b051-54b788abf4f0" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019dfe77-3b04-7ff2-ad86-0f26b9eda506" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_019dfe77-3b04-7755-aef0-77b4ebb93318" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_019dfe77-3b04-7755-aef0-77b4ebb93318" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019dfe77-3b04-79f2-98e4-b2ba03b7856a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019dfe77-3b04-79f2-98e4-b2ba03b7856a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019dfe77-3b04-7c08-96cb-600d821f8284" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019dfe77-3b04-7c08-96cb-600d821f8284" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RepaymentsOfTermLoan_019dfe77-3b04-7c22-93b9-ee0b834213d1" xlink:href="revv-20260405.xsd#revv_RepaymentsOfTermLoan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_revv_RepaymentsOfTermLoan_019dfe77-3b04-7c22-93b9-ee0b834213d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ProceedsFromTermLoan_019dfe77-3b04-71e4-967b-a50fdb9e6535" xlink:href="revv-20260405.xsd#revv_ProceedsFromTermLoan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_revv_ProceedsFromTermLoan_019dfe77-3b04-71e4-967b-a50fdb9e6535" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_019dfe77-3b04-7f2b-acb0-55e3df032b30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfSeniorDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_019dfe77-3b04-7f2b-acb0-55e3df032b30" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_019dfe77-3b04-7151-954f-1e1bc4188167" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_019dfe77-3b04-7151-954f-1e1bc4188167" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_019dfe77-3b04-7b79-9ac4-6e430c77e195" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_019dfe77-3b04-7b79-9ac4-6e430c77e195" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019dfe77-3b04-775e-a734-2f86e2143ba2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019dfe77-3b04-775e-a734-2f86e2143ba2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_019dfe77-3b04-73bd-a4cf-eeed696cb8f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForProceedsFromHedgeFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_019dfe77-3b04-73bd-a4cf-eeed696cb8f8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfDebt_019dfe77-3b04-7690-a131-5fbc567d42f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromRepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfDebt_019dfe77-3b04-7690-a131-5fbc567d42f3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfOtherDebt_019dfe77-3b04-7192-9fc6-45ca352f6286" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromRepaymentsOfOtherDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfOtherDebt_019dfe77-3b04-7192-9fc6-45ca352f6286" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019dfe77-3b04-7cf0-98ba-107a82549b07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019dfe77-3b04-7cf0-98ba-107a82549b07" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_019dfe77-3b04-7995-bf27-a7c6a7ae9c08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_019dfe77-3b04-7995-bf27-a7c6a7ae9c08" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019dfe77-3b04-7bd9-bebe-1afd8f4f560d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019dfe77-3b04-7bd9-bebe-1afd8f4f560d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_019dfe77-3b04-7c27-a780-c8a88bdd7be7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_019dfe77-3b04-7c27-a780-c8a88bdd7be7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_019dfe77-3b04-7879-ae87-1a79ec9b2d31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_019dfe77-3b04-7879-ae87-1a79ec9b2d31" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_019dfe77-3b04-770b-b758-1a813d49c50a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_019dfe77-3b04-770b-b758-1a813d49c50a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019dfe77-3b04-710d-87af-d6eac2808f1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019dfe77-3b04-7a67-9014-82a34989e7ec" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019dfe77-3b04-710d-87af-d6eac2808f1c" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019dfe77-3b04-7a09-bca2-f6a10e83cd6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019dfe77-3b04-7a09-bca2-f6a10e83cd6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019dfe77-3b04-754b-a3dd-ada2bee3f8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019dfe77-3b04-754b-a3dd-ada2bee3f8a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019dfe77-3b04-7c13-8c66-67b56328e119" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019dfe77-3b04-7c13-8c66-67b56328e119" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019dfe77-3b04-74e0-9f67-d4137fcb7c28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_019dfe77-3b04-722e-8dd3-286e51a32838" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_019dfe77-3b04-722e-8dd3-286e51a32838" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019dfe77-3b04-732c-b5eb-cc84a8c57665" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019dfe77-3b04-722e-8dd3-286e51a32838" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019dfe77-3b04-732c-b5eb-cc84a8c57665" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019dfe77-3b04-72a0-bf76-2bb9c771d251" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019dfe77-3b04-732c-b5eb-cc84a8c57665" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019dfe77-3b04-72a0-bf76-2bb9c771d251" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_019dfe77-3b04-7c1a-acf7-2055c104cce0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019dfe77-3b04-732c-b5eb-cc84a8c57665" xlink:to="loc_us-gaap_RestrictedCashCurrent_019dfe77-3b04-7c1a-acf7-2055c104cce0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_019dfe77-3b04-72f9-8a2a-cf0a778dddeb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019dfe77-3b04-732c-b5eb-cc84a8c57665" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_019dfe77-3b04-72f9-8a2a-cf0a778dddeb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019dfe77-3b04-7ead-88da-ea4c12466013" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019dfe77-3b04-7e21-9c95-cbda434e28d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019dfe77-3b04-732c-b5eb-cc84a8c57665" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019dfe77-3b04-7e21-9c95-cbda434e28d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_019dfe77-3b04-7e2b-80dc-13da9bcd6654" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019dfe77-3b04-732c-b5eb-cc84a8c57665" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_019dfe77-3b04-7e2b-80dc-13da9bcd6654" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019dfe77-3b04-77f3-a130-cc81d18f50d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3b04-7d83-8663-a40c8231ce7d" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019dfe77-3b04-77f3-a130-cc81d18f50d3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_EquityIssuedForBusinessCombinationNetOfIssuanceCosts_019dfe77-3b04-7e42-85b3-97bfe0c2c1a6" xlink:href="revv-20260405.xsd#revv_EquityIssuedForBusinessCombinationNetOfIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019dfe77-3b04-77f3-a130-cc81d18f50d3" xlink:to="loc_revv_EquityIssuedForBusinessCombinationNetOfIssuanceCosts_019dfe77-3b04-7e42-85b3-97bfe0c2c1a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherLiabilityIncurredInBusinessCombination_019dfe77-3b04-7244-b51e-cf07d03f7ca7" xlink:href="revv-20260405.xsd#revv_OtherLiabilityIncurredInBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019dfe77-3b04-77f3-a130-cc81d18f50d3" xlink:to="loc_revv_OtherLiabilityIncurredInBusinessCombination_019dfe77-3b04-7244-b51e-cf07d03f7ca7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1_019dfe77-3b04-75b2-916b-9e5405528f11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019dfe77-3b04-77f3-a130-cc81d18f50d3" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1_019dfe77-3b04-75b2-916b-9e5405528f11" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/RevenueNotes" xlink:type="simple" xlink:href="revv-20260405.xsd#RevenueNotes"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/RevenueNotes" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-73f1-be3e-c152a045af51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-73f1-be3e-c152a045af51" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7a5d-b0df-4ea18db5ef33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7a5d-b0df-4ea18db5ef33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7a5d-b0df-4ea18db5ef33_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7a5d-b0df-4ea18db5ef33" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7a5d-b0df-4ea18db5ef33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7b28-837d-27ab7d96d745" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7a5d-b0df-4ea18db5ef33" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7b28-837d-27ab7d96d745" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3b04-701c-b45a-80bc048ccf47" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3b04-7b28-837d-27ab7d96d745" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3b04-701c-b45a-80bc048ccf47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3b04-7f67-b1fa-037550c2b517" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3b04-7b28-837d-27ab7d96d745" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3b04-7f67-b1fa-037550c2b517" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PrimaryendmarketsAxis_019dfe77-3b04-7517-beef-fb97b7f5139b" xlink:href="revv-20260405.xsd#revv_PrimaryendmarketsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_revv_PrimaryendmarketsAxis_019dfe77-3b04-7517-beef-fb97b7f5139b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-7517-beef-fb97b7f5139b_default" xlink:href="revv-20260405.xsd#revv_PrimaryendmarketsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_PrimaryendmarketsAxis_019dfe77-3b04-7517-beef-fb97b7f5139b" xlink:to="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-7517-beef-fb97b7f5139b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-7d7b-a253-890026cbf6ec" xlink:href="revv-20260405.xsd#revv_PrimaryendmarketsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_PrimaryendmarketsAxis_019dfe77-3b04-7517-beef-fb97b7f5139b" xlink:to="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-7d7b-a253-890026cbf6ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3b04-77d8-9b7f-05176a67f10b" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-7d7b-a253-890026cbf6ec" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3b04-77d8-9b7f-05176a67f10b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3b04-71ea-ae3a-37ddcf63e26d" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-7d7b-a253-890026cbf6ec" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3b04-71ea-ae3a-37ddcf63e26d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_MajorGoodsserviceLinesAxis_019dfe77-3b04-7a7f-b94d-0b3c7d1e9709" xlink:href="revv-20260405.xsd#revv_MajorGoodsserviceLinesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_revv_MajorGoodsserviceLinesAxis_019dfe77-3b04-7a7f-b94d-0b3c7d1e9709" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-7a7f-b94d-0b3c7d1e9709_default" xlink:href="revv-20260405.xsd#revv_MajorGoodsserviceLinesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_MajorGoodsserviceLinesAxis_019dfe77-3b04-7a7f-b94d-0b3c7d1e9709" xlink:to="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-7a7f-b94d-0b3c7d1e9709_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-71f2-b546-13c6857c5d03" xlink:href="revv-20260405.xsd#revv_MajorGoodsserviceLinesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_MajorGoodsserviceLinesAxis_019dfe77-3b04-7a7f-b94d-0b3c7d1e9709" xlink:to="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-71f2-b546-13c6857c5d03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesSolutionsMember_019dfe77-3b04-755a-b092-989ffb853425" xlink:href="revv-20260405.xsd#revv_LifeSciencesSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-71f2-b546-13c6857c5d03" xlink:to="loc_revv_LifeSciencesSolutionsMember_019dfe77-3b04-755a-b092-989ffb853425" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SoftwareMember_019dfe77-3b04-7b40-8c04-fdd4e0386ed9" xlink:href="revv-20260405.xsd#revv_SoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-71f2-b546-13c6857c5d03" xlink:to="loc_revv_SoftwareMember_019dfe77-3b04-7b40-8c04-fdd4e0386ed9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ReproductiveHealthMember_019dfe77-3b04-7798-8a28-6b5fdd845ed6" xlink:href="revv-20260405.xsd#revv_ReproductiveHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-71f2-b546-13c6857c5d03" xlink:to="loc_revv_ReproductiveHealthMember_019dfe77-3b04-7798-8a28-6b5fdd845ed6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AppliedGenomicsMember_019dfe77-3b04-76ab-8c85-6ba0fb2042d1" xlink:href="revv-20260405.xsd#revv_AppliedGenomicsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-71f2-b546-13c6857c5d03" xlink:to="loc_revv_AppliedGenomicsMember_019dfe77-3b04-76ab-8c85-6ba0fb2042d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ImmunodiagnosticsMember_019dfe77-3b04-7b7e-8466-4b9e5f6c86a8" xlink:href="revv-20260405.xsd#revv_ImmunodiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-71f2-b546-13c6857c5d03" xlink:to="loc_revv_ImmunodiagnosticsMember_019dfe77-3b04-7b7e-8466-4b9e5f6c86a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019dfe77-3b04-7d62-af06-8f19440809a6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_srt_StatementGeographicalAxis_019dfe77-3b04-7d62-af06-8f19440809a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7d62-af06-8f19440809a6_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019dfe77-3b04-7d62-af06-8f19440809a6" xlink:to="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7d62-af06-8f19440809a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7dc1-a921-1bd21451dd31" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019dfe77-3b04-7d62-af06-8f19440809a6" xlink:to="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7dc1-a921-1bd21451dd31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_019dfe77-3b04-7dbe-92d8-187d1a7e6faa" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7dc1-a921-1bd21451dd31" xlink:to="loc_srt_AmericasMember_019dfe77-3b04-7dbe-92d8-187d1a7e6faa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_019dfe77-3b04-7026-b568-a2daa1a024f6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7dc1-a921-1bd21451dd31" xlink:to="loc_srt_EuropeMember_019dfe77-3b04-7026-b568-a2daa1a024f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_019dfe77-3b04-7801-af81-19b4238348a8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AsiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7dc1-a921-1bd21451dd31" xlink:to="loc_srt_AsiaMember_019dfe77-3b04-7801-af81-19b4238348a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-73dc-80bc-231d425c64dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-73dc-80bc-231d425c64dc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-73dc-80bc-231d425c64dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-73dc-80bc-231d425c64dc" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-73dc-80bc-231d425c64dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-7047-a7d9-1730059d512a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-73dc-80bc-231d425c64dc" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-7047-a7d9-1730059d512a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7141-927d-608875007d14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7141-927d-608875007d14" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7141-927d-608875007d14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7141-927d-608875007d14" xlink:to="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7141-927d-608875007d14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7d89-b404-929dc3fbeb2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7141-927d-608875007d14" xlink:to="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7d89-b404-929dc3fbeb2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-7081-8ed0-ca0427f94813" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-7081-8ed0-ca0427f94813" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-7081-8ed0-ca0427f94813_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-7081-8ed0-ca0427f94813" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-7081-8ed0-ca0427f94813_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-7a9f-b511-0e15f0a6cad9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-7081-8ed0-ca0427f94813" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-7a9f-b511-0e15f0a6cad9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-7803-a827-8c29cfb4e123" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-7803-a827-8c29cfb4e123" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-7803-a827-8c29cfb4e123_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-7803-a827-8c29cfb4e123" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-7803-a827-8c29cfb4e123_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-7b20-a406-6a9ff119848d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-7803-a827-8c29cfb4e123" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-7b20-a406-6a9ff119848d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019dfe77-3b04-767a-8c4e-441eecdb3fa1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-75a4-afbe-e012f270f3c1" xlink:to="loc_srt_MajorCustomersAxis_019dfe77-3b04-767a-8c4e-441eecdb3fa1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-767a-8c4e-441eecdb3fa1_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019dfe77-3b04-767a-8c4e-441eecdb3fa1" xlink:to="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-767a-8c4e-441eecdb3fa1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-7708-8f51-82940f80fdb9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019dfe77-3b04-767a-8c4e-441eecdb3fa1" xlink:to="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-7708-8f51-82940f80fdb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_019dfe77-3b04-743a-8267-355da0728cbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-73f1-be3e-c152a045af51" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_019dfe77-3b04-743a-8267-355da0728cbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dfe77-3b04-7f4a-9b19-dd8f5976bb5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-73f1-be3e-c152a045af51" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dfe77-3b04-7f4a-9b19-dd8f5976bb5a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/RevenueTables" xlink:type="simple" xlink:href="revv-20260405.xsd#RevenueTables"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/RevenueTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-76fb-8258-680389ea294b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-76fb-8258-680389ea294b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7683-b987-69910a10ff09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7683-b987-69910a10ff09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7683-b987-69910a10ff09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7683-b987-69910a10ff09" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7683-b987-69910a10ff09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-772a-95fb-00b0949994ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7683-b987-69910a10ff09" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-772a-95fb-00b0949994ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019dfe77-3b04-7d98-9fcc-dd4e16389889" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:to="loc_srt_StatementGeographicalAxis_019dfe77-3b04-7d98-9fcc-dd4e16389889" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7d98-9fcc-dd4e16389889_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019dfe77-3b04-7d98-9fcc-dd4e16389889" xlink:to="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7d98-9fcc-dd4e16389889_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7313-a10e-e121d43fad58" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019dfe77-3b04-7d98-9fcc-dd4e16389889" xlink:to="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7313-a10e-e121d43fad58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-7d79-ac01-64c938c03cd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-7d79-ac01-64c938c03cd1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-7d79-ac01-64c938c03cd1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-7d79-ac01-64c938c03cd1" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-7d79-ac01-64c938c03cd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-70bb-8fb2-a0a67ec19bc3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-7d79-ac01-64c938c03cd1" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-70bb-8fb2-a0a67ec19bc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7d7a-adcd-22a46d84a237" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:to="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7d7a-adcd-22a46d84a237" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7d7a-adcd-22a46d84a237_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7d7a-adcd-22a46d84a237" xlink:to="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7d7a-adcd-22a46d84a237_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7de7-8782-61651423cf7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7d7a-adcd-22a46d84a237" xlink:to="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7de7-8782-61651423cf7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-70a8-b908-1db1f9981186" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-70a8-b908-1db1f9981186" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-70a8-b908-1db1f9981186_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-70a8-b908-1db1f9981186" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-70a8-b908-1db1f9981186_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-7dac-8055-909f1030315d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-70a8-b908-1db1f9981186" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-7dac-8055-909f1030315d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-7249-b5ff-5ef7e443a7f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-7249-b5ff-5ef7e443a7f2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-7249-b5ff-5ef7e443a7f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-7249-b5ff-5ef7e443a7f2" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-7249-b5ff-5ef7e443a7f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-783d-bac2-b211e55180ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-7249-b5ff-5ef7e443a7f2" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-783d-bac2-b211e55180ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019dfe77-3b04-7d00-81f1-2093697f111b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-7c76-8505-e1813d932d07" xlink:to="loc_srt_MajorCustomersAxis_019dfe77-3b04-7d00-81f1-2093697f111b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-7d00-81f1-2093697f111b_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019dfe77-3b04-7d00-81f1-2093697f111b" xlink:to="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-7d00-81f1-2093697f111b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-7aa8-af45-dada60cee112" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019dfe77-3b04-7d00-81f1-2093697f111b" xlink:to="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-7aa8-af45-dada60cee112" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_019dfe77-3b04-74b6-be44-14024a519798" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-76fb-8258-680389ea294b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_019dfe77-3b04-74b6-be44-14024a519798" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/BusinessCombinationsTables" xlink:type="simple" xlink:href="revv-20260405.xsd#BusinessCombinationsTables"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/BusinessCombinationsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7f3c-b6ea-d5a0bc40591f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-75d3-a423-064f1f7bed33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7f3c-b6ea-d5a0bc40591f" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-75d3-a423-064f1f7bed33" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-73e5-af45-aee33fe7db81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-75d3-a423-064f1f7bed33" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-73e5-af45-aee33fe7db81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-73e5-af45-aee33fe7db81_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-73e5-af45-aee33fe7db81" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-73e5-af45-aee33fe7db81_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7701-a485-eca891d71cf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-73e5-af45-aee33fe7db81" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7701-a485-eca891d71cf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ScheduleofBusinessAcquisitionsbyAcquisition1TableTextBlock_019dfe77-3b04-7912-a3fd-24a0f3f9356c" xlink:href="revv-20260405.xsd#revv_ScheduleofBusinessAcquisitionsbyAcquisition1TableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7f3c-b6ea-d5a0bc40591f" xlink:to="loc_revv_ScheduleofBusinessAcquisitionsbyAcquisition1TableTextBlock_019dfe77-3b04-7912-a3fd-24a0f3f9356c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock_019dfe77-3b04-7126-8894-a9cfd4aa5e48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7f3c-b6ea-d5a0bc40591f" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock_019dfe77-3b04-7126-8894-a9cfd4aa5e48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_019dfe77-3b04-7daf-a315-cdffcdabd89f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7f3c-b6ea-d5a0bc40591f" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_019dfe77-3b04-7daf-a315-cdffcdabd89f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/RestructuringandRelatedActivitiesTables" xlink:type="simple" xlink:href="revv-20260405.xsd#RestructuringandRelatedActivitiesTables"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/RestructuringandRelatedActivitiesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-712b-b67a-618a00665a1c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-712b-b67a-618a00665a1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-73ef-a672-1b459c2f9c28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-73ef-a672-1b459c2f9c28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7279-b8f0-54427a23f4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7279-b8f0-54427a23f4e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-76a1-bb53-b7b863023ca1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-76a1-bb53-b7b863023ca1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-78be-babc-e640a2380511" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-78be-babc-e640a2380511" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7494-b4a0-546502680eca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7494-b4a0-546502680eca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-72fa-8471-2894c7db554f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-72fa-8471-2894c7db554f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7591-b210-34c23c1fc7e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7591-b210-34c23c1fc7e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7b41-854c-1be6926f566a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7b41-854c-1be6926f566a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019dfe77-3bc1-7b95-a9ac-5fe5c4b96249" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019dfe77-3bc1-7b95-a9ac-5fe5c4b96249" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeBalanceAxis_019dfe77-3bc1-79bb-8049-254d5340badd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeBalanceAxis_019dfe77-3bc1-79bb-8049-254d5340badd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_019dfe77-3bc1-750d-9670-c23b0266c1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_019dfe77-3bc1-750d-9670-c23b0266c1e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_019dfe77-3bc1-7a5e-81a6-b5cff9a36a38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_019dfe77-3bc1-7a5e-81a6-b5cff9a36a38" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/RestructuringandRelatedActivitiesTables_1" xlink:type="simple" xlink:href="revv-20260405.xsd#RestructuringandRelatedActivitiesTables_1"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/RestructuringandRelatedActivitiesTables_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-712b-b67a-618a00665a1c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-712b-b67a-618a00665a1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-73ef-a672-1b459c2f9c28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-73ef-a672-1b459c2f9c28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7279-b8f0-54427a23f4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7279-b8f0-54427a23f4e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-76a1-bb53-b7b863023ca1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-76a1-bb53-b7b863023ca1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-78be-babc-e640a2380511" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-78be-babc-e640a2380511" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7494-b4a0-546502680eca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7494-b4a0-546502680eca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-72fa-8471-2894c7db554f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-72fa-8471-2894c7db554f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7591-b210-34c23c1fc7e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7591-b210-34c23c1fc7e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7b41-854c-1be6926f566a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7b41-854c-1be6926f566a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_019dfe77-3bc1-750d-9670-c23b0266c1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_019dfe77-3bc1-750d-9670-c23b0266c1e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_019dfe77-3bc1-7a5e-81a6-b5cff9a36a38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_019dfe77-3bc1-7a5e-81a6-b5cff9a36a38" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/RestructuringandRelatedActivitiesTables_2" xlink:type="simple" xlink:href="revv-20260405.xsd#RestructuringandRelatedActivitiesTables_2"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/RestructuringandRelatedActivitiesTables_2" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-712b-b67a-618a00665a1c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-712b-b67a-618a00665a1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-73ef-a672-1b459c2f9c28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-73ef-a672-1b459c2f9c28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7279-b8f0-54427a23f4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7279-b8f0-54427a23f4e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-76a1-bb53-b7b863023ca1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-76a1-bb53-b7b863023ca1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-78be-babc-e640a2380511" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-78be-babc-e640a2380511" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7494-b4a0-546502680eca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7494-b4a0-546502680eca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-72fa-8471-2894c7db554f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-72fa-8471-2894c7db554f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7591-b210-34c23c1fc7e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7591-b210-34c23c1fc7e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7b41-854c-1be6926f566a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7b41-854c-1be6926f566a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeBalanceAxis_019dfe77-3bc1-79bb-8049-254d5340badd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeBalanceAxis_019dfe77-3bc1-79bb-8049-254d5340badd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_019dfe77-3bc1-750d-9670-c23b0266c1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_019dfe77-3bc1-750d-9670-c23b0266c1e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_019dfe77-3bc1-7a5e-81a6-b5cff9a36a38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_019dfe77-3bc1-7a5e-81a6-b5cff9a36a38" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/RestructuringandRelatedActivitiesTables_3" xlink:type="simple" xlink:href="revv-20260405.xsd#RestructuringandRelatedActivitiesTables_3"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/RestructuringandRelatedActivitiesTables_3" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-712b-b67a-618a00665a1c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7b26-8ead-ec87a04cb9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-712b-b67a-618a00665a1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-73ef-a672-1b459c2f9c28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-73ef-a672-1b459c2f9c28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7279-b8f0-54427a23f4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-73ef-a672-1b459c2f9c28" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7279-b8f0-54427a23f4e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-76a1-bb53-b7b863023ca1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-76a1-bb53-b7b863023ca1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-78be-babc-e640a2380511" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-76a1-bb53-b7b863023ca1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-78be-babc-e640a2380511" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7494-b4a0-546502680eca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7494-b4a0-546502680eca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-72fa-8471-2894c7db554f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7494-b4a0-546502680eca" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-72fa-8471-2894c7db554f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7591-b210-34c23c1fc7e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7591-b210-34c23c1fc7e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7b41-854c-1be6926f566a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-7591-b210-34c23c1fc7e8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-7b41-854c-1be6926f566a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019dfe77-3bc1-7b95-a9ac-5fe5c4b96249" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-71b6-af5b-5c4483dcbe1b" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019dfe77-3bc1-7b95-a9ac-5fe5c4b96249" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_019dfe77-3bc1-750d-9670-c23b0266c1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_019dfe77-3bc1-750d-9670-c23b0266c1e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_019dfe77-3bc1-7a5e-81a6-b5cff9a36a38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7c80-a93d-f98f288e9447" xlink:to="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_019dfe77-3bc1-7a5e-81a6-b5cff9a36a38" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/BasisofPresentationBasisofPresentationDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#BasisofPresentationBasisofPresentationDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/BasisofPresentationBasisofPresentationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:href="revv-20260405.xsd#revv_BasisofPresentationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BasisofPresentationTable_019dfe77-3b04-7123-928c-caf6ccf87eae" xlink:href="revv-20260405.xsd#revv_BasisofPresentationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_BasisofPresentationTable_019dfe77-3b04-7123-928c-caf6ccf87eae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019dfe77-3b04-709c-aa5b-d402ee078d1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_BasisofPresentationTable_019dfe77-3b04-7123-928c-caf6ccf87eae" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019dfe77-3b04-709c-aa5b-d402ee078d1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019dfe77-3b04-709c-aa5b-d402ee078d1a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019dfe77-3b04-709c-aa5b-d402ee078d1a" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019dfe77-3b04-709c-aa5b-d402ee078d1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019dfe77-3b04-7078-9254-76740a539a67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019dfe77-3b04-709c-aa5b-d402ee078d1a" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019dfe77-3b04-7078-9254-76740a539a67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019dfe77-3b04-7f78-9d8b-459eb3f10464" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019dfe77-3b04-7078-9254-76740a539a67" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019dfe77-3b04-7f78-9d8b-459eb3f10464" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019dfe77-3b04-7051-99aa-17cca44ff947" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_BasisofPresentationTable_019dfe77-3b04-7123-928c-caf6ccf87eae" xlink:to="loc_srt_RangeAxis_019dfe77-3b04-7051-99aa-17cca44ff947" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3b04-7051-99aa-17cca44ff947_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019dfe77-3b04-7051-99aa-17cca44ff947" xlink:to="loc_srt_RangeMember_019dfe77-3b04-7051-99aa-17cca44ff947_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3b04-7b02-ad05-b0e89ae0cb1b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019dfe77-3b04-7051-99aa-17cca44ff947" xlink:to="loc_srt_RangeMember_019dfe77-3b04-7b02-ad05-b0e89ae0cb1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019dfe77-3b04-74ab-b789-a70b7471886b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_BasisofPresentationTable_019dfe77-3b04-7123-928c-caf6ccf87eae" xlink:to="loc_srt_StatementScenarioAxis_019dfe77-3b04-74ab-b789-a70b7471886b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-74ab-b789-a70b7471886b_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-74ab-b789-a70b7471886b" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-74ab-b789-a70b7471886b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-77d1-a1cb-9682c38fdcb6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019dfe77-3b04-74ab-b789-a70b7471886b" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-77d1-a1cb-9682c38fdcb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019dfe77-3b04-7168-a1db-ad1c5de238c8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019dfe77-3b04-77d1-a1cb-9682c38fdcb6" xlink:to="loc_srt_ScenarioForecastMember_019dfe77-3b04-7168-a1db-ad1c5de238c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_019dfe77-3b04-7c08-8349-6f7e45238796" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_BasisofPresentationTable_019dfe77-3b04-7123-928c-caf6ccf87eae" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_019dfe77-3b04-7c08-8349-6f7e45238796" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_019dfe77-3b04-7c08-8349-6f7e45238796_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_019dfe77-3b04-7c08-8349-6f7e45238796" xlink:to="loc_us-gaap_TypeOfAdoptionMember_019dfe77-3b04-7c08-8349-6f7e45238796_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_019dfe77-3b04-7dc5-8e95-8970b3208f1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_019dfe77-3b04-7c08-8349-6f7e45238796" xlink:to="loc_us-gaap_TypeOfAdoptionMember_019dfe77-3b04-7dc5-8e95-8970b3208f1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanOtherCosts_019dfe77-3b04-70b4-8d69-d4651bd62089" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanOtherCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_us-gaap_DefinedBenefitPlanOtherCosts_019dfe77-3b04-70b4-8d69-d4651bd62089" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019dfe77-3b04-7061-9fb8-303ce8ef89ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019dfe77-3b04-7061-9fb8-303ce8ef89ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ImpactofNewAccountingPrincipleCashFlows_019dfe77-3b04-7859-9feb-e5e3a09ead6a" xlink:href="revv-20260405.xsd#revv_ImpactofNewAccountingPrincipleCashFlows"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_ImpactofNewAccountingPrincipleCashFlows_019dfe77-3b04-7859-9feb-e5e3a09ead6a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_EntitysOperatingCycle_019dfe77-3b04-75e1-9391-e1a323bbd152" xlink:href="revv-20260405.xsd#revv_EntitysOperatingCycle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_EntitysOperatingCycle_019dfe77-3b04-75e1-9391-e1a323bbd152" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CumulativeEffectOfNewAccountingPronouncementInPeriodOfAdoption_019dfe77-3b04-7549-8d4a-f0cbe1296d0f" xlink:href="revv-20260405.xsd#revv_CumulativeEffectOfNewAccountingPronouncementInPeriodOfAdoption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_CumulativeEffectOfNewAccountingPronouncementInPeriodOfAdoption_019dfe77-3b04-7549-8d4a-f0cbe1296d0f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ImpactofNewAccountingPrincipleDeferredRevenue_019dfe77-3b04-7a41-a5f8-7923f4830278" xlink:href="revv-20260405.xsd#revv_ImpactofNewAccountingPrincipleDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_ImpactofNewAccountingPrincipleDeferredRevenue_019dfe77-3b04-7a41-a5f8-7923f4830278" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TaximpactofCumulativeAdjustmentsDeferredIncomeTax_019dfe77-3b04-7fb9-ba07-6d53d02bf998" xlink:href="revv-20260405.xsd#revv_TaximpactofCumulativeAdjustmentsDeferredIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_TaximpactofCumulativeAdjustmentsDeferredIncomeTax_019dfe77-3b04-7fb9-ba07-6d53d02bf998" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ImpactofNewAccountingPrinciplesDeferredTaxAssets_019dfe77-3b04-7185-93b7-bf4722fb8f8d" xlink:href="revv-20260405.xsd#revv_ImpactofNewAccountingPrinciplesDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_ImpactofNewAccountingPrinciplesDeferredTaxAssets_019dfe77-3b04-7185-93b7-bf4722fb8f8d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ImpactofNewAccountingPrinciplesPrepaidTaxes_019dfe77-3b04-7eec-87b4-b99174c57fdf" xlink:href="revv-20260405.xsd#revv_ImpactofNewAccountingPrinciplesPrepaidTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_ImpactofNewAccountingPrinciplesPrepaidTaxes_019dfe77-3b04-7eec-87b4-b99174c57fdf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019dfe77-3b04-737e-b053-8b3eb28d220d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019dfe77-3b04-737e-b053-8b3eb28d220d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019dfe77-3b04-7c2a-9a0f-7cf15e8afbe9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019dfe77-3b04-7c2a-9a0f-7cf15e8afbe9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019dfe77-3b04-798b-98b3-2d412f392ee9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_us-gaap_OperatingLeaseLiability_019dfe77-3b04-798b-98b3-2d412f392ee9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ImpactofNewAccountingPrinciplePropertyandEquipment_019dfe77-3b04-7371-97d6-96b7b6bc3b39" xlink:href="revv-20260405.xsd#revv_ImpactofNewAccountingPrinciplePropertyandEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_ImpactofNewAccountingPrinciplePropertyandEquipment_019dfe77-3b04-7371-97d6-96b7b6bc3b39" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TaxImpactofCumulativeAdjustmentsDeferredTaxLiabilities_019dfe77-3b04-7caf-a4e4-daf0fb3b0716" xlink:href="revv-20260405.xsd#revv_TaxImpactofCumulativeAdjustmentsDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_revv_TaxImpactofCumulativeAdjustmentsDeferredTaxLiabilities_019dfe77-3b04-7caf-a4e4-daf0fb3b0716" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCycle1_019dfe77-3b04-7441-9d03-a47ab5db13e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingCycle1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BasisofPresentationLineItems_019dfe77-3b04-7eb1-9422-bd173d49ad3d" xlink:to="loc_us-gaap_OperatingCycle1_019dfe77-3b04-7441-9d03-a47ab5db13e7" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/RevenueDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#RevenueDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/RevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PrimaryendmarketsAxis_019dfe77-3b04-7ab8-9942-2e9852ad1ebf" xlink:href="revv-20260405.xsd#revv_PrimaryendmarketsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_revv_PrimaryendmarketsAxis_019dfe77-3b04-7ab8-9942-2e9852ad1ebf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-7ab8-9942-2e9852ad1ebf_default" xlink:href="revv-20260405.xsd#revv_PrimaryendmarketsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_PrimaryendmarketsAxis_019dfe77-3b04-7ab8-9942-2e9852ad1ebf" xlink:to="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-7ab8-9942-2e9852ad1ebf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-755b-94d2-ec6bc5465e57" xlink:href="revv-20260405.xsd#revv_PrimaryendmarketsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_PrimaryendmarketsAxis_019dfe77-3b04-7ab8-9942-2e9852ad1ebf" xlink:to="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-755b-94d2-ec6bc5465e57" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3b04-7668-89a9-49f3957b8e77" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-755b-94d2-ec6bc5465e57" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3b04-7668-89a9-49f3957b8e77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3b04-7ac8-99b5-d176171903e8" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_PrimaryendmarketsDomain_019dfe77-3b04-755b-94d2-ec6bc5465e57" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3b04-7ac8-99b5-d176171903e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_MajorGoodsserviceLinesAxis_019dfe77-3b04-799b-80ea-d588258a8fc0" xlink:href="revv-20260405.xsd#revv_MajorGoodsserviceLinesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_revv_MajorGoodsserviceLinesAxis_019dfe77-3b04-799b-80ea-d588258a8fc0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-799b-80ea-d588258a8fc0_default" xlink:href="revv-20260405.xsd#revv_MajorGoodsserviceLinesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_MajorGoodsserviceLinesAxis_019dfe77-3b04-799b-80ea-d588258a8fc0" xlink:to="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-799b-80ea-d588258a8fc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-777a-a4b5-b66d90397c38" xlink:href="revv-20260405.xsd#revv_MajorGoodsserviceLinesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_MajorGoodsserviceLinesAxis_019dfe77-3b04-799b-80ea-d588258a8fc0" xlink:to="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-777a-a4b5-b66d90397c38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesSolutionsMember_019dfe77-3b04-7a6c-97b7-b4645c735cd7" xlink:href="revv-20260405.xsd#revv_LifeSciencesSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-777a-a4b5-b66d90397c38" xlink:to="loc_revv_LifeSciencesSolutionsMember_019dfe77-3b04-7a6c-97b7-b4645c735cd7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SoftwareMember_019dfe77-3b04-7d7b-9cb7-d8a2c413e0e5" xlink:href="revv-20260405.xsd#revv_SoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-777a-a4b5-b66d90397c38" xlink:to="loc_revv_SoftwareMember_019dfe77-3b04-7d7b-9cb7-d8a2c413e0e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ReproductiveHealthMember_019dfe77-3b04-746a-a7b1-fd5043942ebe" xlink:href="revv-20260405.xsd#revv_ReproductiveHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-777a-a4b5-b66d90397c38" xlink:to="loc_revv_ReproductiveHealthMember_019dfe77-3b04-746a-a7b1-fd5043942ebe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AppliedGenomicsMember_019dfe77-3b04-7fe1-8e0b-65e954b3961d" xlink:href="revv-20260405.xsd#revv_AppliedGenomicsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-777a-a4b5-b66d90397c38" xlink:to="loc_revv_AppliedGenomicsMember_019dfe77-3b04-7fe1-8e0b-65e954b3961d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ImmunodiagnosticsMember_019dfe77-3b04-7b83-8639-7191ff0861e7" xlink:href="revv-20260405.xsd#revv_ImmunodiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_MajorGoodsserviceLinesDomain_019dfe77-3b04-777a-a4b5-b66d90397c38" xlink:to="loc_revv_ImmunodiagnosticsMember_019dfe77-3b04-7b83-8639-7191ff0861e7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7792-8866-e2a60d528ce5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7792-8866-e2a60d528ce5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7792-8866-e2a60d528ce5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7792-8866-e2a60d528ce5" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7792-8866-e2a60d528ce5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7a16-9985-6940a491ac66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7792-8866-e2a60d528ce5" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7a16-9985-6940a491ac66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3b04-793f-b50f-e65b72e5a00a" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3b04-7a16-9985-6940a491ac66" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3b04-793f-b50f-e65b72e5a00a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3b04-77f0-a1f0-56c4516e65d0" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3b04-7a16-9985-6940a491ac66" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3b04-77f0-a1f0-56c4516e65d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019dfe77-3b04-71a6-9c33-41581a745e60" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_srt_StatementGeographicalAxis_019dfe77-3b04-71a6-9c33-41581a745e60" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-71a6-9c33-41581a745e60_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019dfe77-3b04-71a6-9c33-41581a745e60" xlink:to="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-71a6-9c33-41581a745e60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7743-a726-4daeb886df89" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019dfe77-3b04-71a6-9c33-41581a745e60" xlink:to="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7743-a726-4daeb886df89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_019dfe77-3b04-7cc2-89c4-9d3999736fe7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7743-a726-4daeb886df89" xlink:to="loc_srt_AmericasMember_019dfe77-3b04-7cc2-89c4-9d3999736fe7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_019dfe77-3b04-7a0a-a613-d4bf8a69d20a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7743-a726-4daeb886df89" xlink:to="loc_srt_EuropeMember_019dfe77-3b04-7a0a-a613-d4bf8a69d20a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_019dfe77-3b04-75f2-a072-b92a22438035" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AsiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019dfe77-3b04-7743-a726-4daeb886df89" xlink:to="loc_srt_AsiaMember_019dfe77-3b04-75f2-a072-b92a22438035" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-765f-80c3-474a1638b2eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-765f-80c3-474a1638b2eb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-765f-80c3-474a1638b2eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-765f-80c3-474a1638b2eb" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-765f-80c3-474a1638b2eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-7364-9ab7-bb5abf7c434f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019dfe77-3b04-765f-80c3-474a1638b2eb" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019dfe77-3b04-7364-9ab7-bb5abf7c434f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7bb9-a776-d2c9cfd3f888" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7bb9-a776-d2c9cfd3f888" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7bb9-a776-d2c9cfd3f888_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7bb9-a776-d2c9cfd3f888" xlink:to="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7bb9-a776-d2c9cfd3f888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7551-9bc9-53edc745fcfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerDurationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_019dfe77-3b04-7bb9-a776-d2c9cfd3f888" xlink:to="loc_us-gaap_ContractWithCustomerDurationDomain_019dfe77-3b04-7551-9bc9-53edc745fcfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-737b-a638-887d7d2fc4a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-737b-a638-887d7d2fc4a5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-737b-a638-887d7d2fc4a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-737b-a638-887d7d2fc4a5" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-737b-a638-887d7d2fc4a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-7e72-9cf1-0bcfe64117c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019dfe77-3b04-737b-a638-887d7d2fc4a5" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019dfe77-3b04-7e72-9cf1-0bcfe64117c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-717d-9589-d88a05f27af8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-717d-9589-d88a05f27af8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-717d-9589-d88a05f27af8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-717d-9589-d88a05f27af8" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-717d-9589-d88a05f27af8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-7cbb-87cd-22deaf95fd07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_019dfe77-3b04-717d-9589-d88a05f27af8" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_019dfe77-3b04-7cbb-87cd-22deaf95fd07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019dfe77-3b04-797e-9ca7-e42634dbbf38" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_srt_MajorCustomersAxis_019dfe77-3b04-797e-9ca7-e42634dbbf38" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-797e-9ca7-e42634dbbf38_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019dfe77-3b04-797e-9ca7-e42634dbbf38" xlink:to="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-797e-9ca7-e42634dbbf38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-7de6-a2f0-c3b5eebc30c6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019dfe77-3b04-797e-9ca7-e42634dbbf38" xlink:to="loc_srt_NameOfMajorCustomerDomain_019dfe77-3b04-7de6-a2f0-c3b5eebc30c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3b04-7f05-aca5-1d2523f3cafc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3b04-7f05-aca5-1d2523f3cafc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-7f05-aca5-1d2523f3cafc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3b04-7f05-aca5-1d2523f3cafc" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-7f05-aca5-1d2523f3cafc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-7374-b757-f00b18c66a43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3b04-7f05-aca5-1d2523f3cafc" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-7374-b757-f00b18c66a43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dfe77-3b04-7ec2-a492-35c7d8539004" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-7374-b757-f00b18c66a43" xlink:to="loc_us-gaap_SubsequentEventMember_019dfe77-3b04-7ec2-a492-35c7d8539004" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-76ac-8e71-fef972968658" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019dfe77-3b04-757d-b1b4-a92d734b1478" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-76ac-8e71-fef972968658" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-76ac-8e71-fef972968658_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-76ac-8e71-fef972968658" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-76ac-8e71-fef972968658_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7d5b-bc8d-f97708a925fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-76ac-8e71-fef972968658" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7d5b-bc8d-f97708a925fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dfe77-3b04-7ae7-bf66-85bf7557f79e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dfe77-3b04-7ae7-bf66-85bf7557f79e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_UnbilledReceivables_019dfe77-3b04-7393-b9df-8e327002761d" xlink:href="revv-20260405.xsd#revv_UnbilledReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_revv_UnbilledReceivables_019dfe77-3b04-7393-b9df-8e327002761d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledReceivablesCurrent_019e07a5-18f1-7f96-82f0-fec5c28540e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnbilledReceivablesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_us-gaap_UnbilledReceivablesCurrent_019e07a5-18f1-7f96-82f0-fec5c28540e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_UnbilledReceivablesNoncurrent_019dfe77-3b04-783a-b28d-3e5f853e569e" xlink:href="revv-20260405.xsd#revv_UnbilledReceivablesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_revv_UnbilledReceivablesNoncurrent_019dfe77-3b04-783a-b28d-3e5f853e569e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenue_019dfe77-3b04-74a5-9fa9-83a6397bf19b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_us-gaap_DeferredRevenue_019dfe77-3b04-74a5-9fa9-83a6397bf19b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenueCurrent_019e07a7-5990-7c5c-bfbc-b528d39989b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredRevenueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_us-gaap_DeferredRevenueCurrent_019e07a7-5990-7c5c-bfbc-b528d39989b5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenueNoncurrent_019e07ab-34a1-71d5-a40e-c458b43a26b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredRevenueNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_us-gaap_DeferredRevenueNoncurrent_019e07ab-34a1-71d5-a40e-c458b43a26b9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CustomerDepositsReceivedInAdvanceOfTransferOfControl_019dfe77-3b04-7159-82ee-64e2b9d83bc2" xlink:href="revv-20260405.xsd#revv_CustomerDepositsReceivedInAdvanceOfTransferOfControl"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_revv_CustomerDepositsReceivedInAdvanceOfTransferOfControl_019dfe77-3b04-7159-82ee-64e2b9d83bc2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RemainingPerformanceObligations_019dfe77-3b04-77f1-9c43-91c8b17bff77" xlink:href="revv-20260405.xsd#revv_RemainingPerformanceObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019dfe77-3b04-7db7-841b-71bff2fe2dfa" xlink:to="loc_revv_RemainingPerformanceObligations_019dfe77-3b04-77f1-9c43-91c8b17bff77" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/BusinessCombinationsNarrativeDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#BusinessCombinationsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/BusinessCombinationsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsAxis_019dfe77-3b04-76ca-9e39-4cda0d5fb4c1" xlink:href="revv-20260405.xsd#revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:to="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsAxis_019dfe77-3b04-76ca-9e39-4cda0d5fb4c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsDomain_019dfe77-3b04-76ca-9e39-4cda0d5fb4c1_default" xlink:href="revv-20260405.xsd#revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsAxis_019dfe77-3b04-76ca-9e39-4cda0d5fb4c1" xlink:to="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsDomain_019dfe77-3b04-76ca-9e39-4cda0d5fb4c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsDomain_019dfe77-3b04-7627-b81e-bb180403ebb4" xlink:href="revv-20260405.xsd#revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsAxis_019dfe77-3b04-76ca-9e39-4cda0d5fb4c1" xlink:to="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsDomain_019dfe77-3b04-7627-b81e-bb180403ebb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AmortizationOfIntangibleAssetsRecognizedInAcquisitionMember_019dfe77-3b04-76a5-b6d3-a028f7dc4919" xlink:href="revv-20260405.xsd#revv_AmortizationOfIntangibleAssetsRecognizedInAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsDomain_019dfe77-3b04-7627-b81e-bb180403ebb4" xlink:to="loc_revv_AmortizationOfIntangibleAssetsRecognizedInAcquisitionMember_019dfe77-3b04-76a5-b6d3-a028f7dc4919" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AmortizationOfFairValueAdjustmentToAcquiredInventoryMember_019dfe77-3b04-7d35-a4e8-4e413d189751" xlink:href="revv-20260405.xsd#revv_AmortizationOfFairValueAdjustmentToAcquiredInventoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActualComponentsDomain_019dfe77-3b04-7627-b81e-bb180403ebb4" xlink:to="loc_revv_AmortizationOfFairValueAdjustmentToAcquiredInventoryMember_019dfe77-3b04-7d35-a4e8-4e413d189751" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationSourceofConsiderationTransferredAxis_019dfe77-3b04-701e-aa37-c054e38c06da" xlink:href="revv-20260405.xsd#revv_BusinessCombinationSourceofConsiderationTransferredAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:to="loc_revv_BusinessCombinationSourceofConsiderationTransferredAxis_019dfe77-3b04-701e-aa37-c054e38c06da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationSourceofConsiderationTransferredDomain_019dfe77-3b04-701e-aa37-c054e38c06da_default" xlink:href="revv-20260405.xsd#revv_BusinessCombinationSourceofConsiderationTransferredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_BusinessCombinationSourceofConsiderationTransferredAxis_019dfe77-3b04-701e-aa37-c054e38c06da" xlink:to="loc_revv_BusinessCombinationSourceofConsiderationTransferredDomain_019dfe77-3b04-701e-aa37-c054e38c06da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationSourceofConsiderationTransferredDomain_019dfe77-3b04-790c-b9b1-239e2a2c085e" xlink:href="revv-20260405.xsd#revv_BusinessCombinationSourceofConsiderationTransferredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_BusinessCombinationSourceofConsiderationTransferredAxis_019dfe77-3b04-701e-aa37-c054e38c06da" xlink:to="loc_revv_BusinessCombinationSourceofConsiderationTransferredDomain_019dfe77-3b04-790c-b9b1-239e2a2c085e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_019dfe77-3b04-720f-96db-0e82ad36b801" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BusinessCombinationSourceofConsiderationTransferredDomain_019dfe77-3b04-790c-b9b1-239e2a2c085e" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_019dfe77-3b04-720f-96db-0e82ad36b801" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SeniorUnsecuredNotesMember_019dfe77-3b04-7d8d-9a1b-28882ea4cb4f" xlink:href="revv-20260405.xsd#revv_SeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BusinessCombinationSourceofConsiderationTransferredDomain_019dfe77-3b04-790c-b9b1-239e2a2c085e" xlink:to="loc_revv_SeniorUnsecuredNotesMember_019dfe77-3b04-7d8d-9a1b-28882ea4cb4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LineOfCreditMaturingAugust242026Member_019dfe77-3b04-710a-9c16-414d57cfeff0" xlink:href="revv-20260405.xsd#revv_LineOfCreditMaturingAugust242026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BusinessCombinationSourceofConsiderationTransferredDomain_019dfe77-3b04-790c-b9b1-239e2a2c085e" xlink:to="loc_revv_LineOfCreditMaturingAugust242026Member_019dfe77-3b04-710a-9c16-414d57cfeff0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LineofCreditMaturingSeptember172024Member_019dfe77-3b04-7d7a-81ba-03d8d9f04fa1" xlink:href="revv-20260405.xsd#revv_LineofCreditMaturingSeptember172024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_BusinessCombinationSourceofConsiderationTransferredDomain_019dfe77-3b04-790c-b9b1-239e2a2c085e" xlink:to="loc_revv_LineofCreditMaturingSeptember172024Member_019dfe77-3b04-7d7a-81ba-03d8d9f04fa1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019dfe77-3b04-7816-90ca-01adbff028c3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:to="loc_srt_CurrencyAxis_019dfe77-3b04-7816-90ca-01adbff028c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3b04-7816-90ca-01adbff028c3_default" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019dfe77-3b04-7816-90ca-01adbff028c3" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3b04-7816-90ca-01adbff028c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3b04-747f-9c8c-ecda1b58fd2d" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019dfe77-3b04-7816-90ca-01adbff028c3" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3b04-747f-9c8c-ecda1b58fd2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_USD_019dfe77-3b04-74a6-b23e-67962f63636d" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_USD"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019dfe77-3b04-747f-9c8c-ecda1b58fd2d" xlink:to="loc_currency_USD_019dfe77-3b04-74a6-b23e-67962f63636d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3b04-747f-a6bd-61a8a82daa2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3b04-747f-a6bd-61a8a82daa2d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-747f-a6bd-61a8a82daa2d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3b04-747f-a6bd-61a8a82daa2d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-747f-a6bd-61a8a82daa2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-7c2f-bb11-35fbe4c69fbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3b04-747f-a6bd-61a8a82daa2d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-7c2f-bb11-35fbe4c69fbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dfe77-3b04-7915-a7a4-11ab146d1e06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3b04-7c2f-bb11-35fbe4c69fbc" xlink:to="loc_us-gaap_SubsequentEventMember_019dfe77-3b04-7915-a7a4-11ab146d1e06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3b04-7700-9816-b8075c5825ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3b04-7700-9816-b8075c5825ef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7700-9816-b8075c5825ef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3b04-7700-9816-b8075c5825ef" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7700-9816-b8075c5825ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3b04-7700-9816-b8075c5825ef" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CoreTechnologyMember_019dfe77-3b04-713b-8818-fa64abb5e5bf" xlink:href="revv-20260405.xsd#revv_CoreTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:to="loc_revv_CoreTechnologyMember_019dfe77-3b04-713b-8818-fa64abb5e5bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019dfe77-3b04-7139-a080-f3cb621301a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019dfe77-3b04-7139-a080-f3cb621301a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019dfe77-3b04-753f-8714-ce370002adee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:to="loc_us-gaap_TradeNamesMember_019dfe77-3b04-753f-8714-ce370002adee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_019dfe77-3b04-764d-8b34-360c19c41ecb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:to="loc_us-gaap_LicensingAgreementsMember_019dfe77-3b04-764d-8b34-360c19c41ecb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InProcessResearchAndDevelopmentMember_019dfe77-3b04-7f8c-bcf6-9841ac3c8f25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InProcessResearchAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:to="loc_us-gaap_InProcessResearchAndDevelopmentMember_019dfe77-3b04-7f8c-bcf6-9841ac3c8f25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019dfe77-3b04-71be-8101-5ecdf5ff62bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019dfe77-3b04-71be-8101-5ecdf5ff62bf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrderOrProductionBacklogMember_019dfe77-3b04-73ee-8bf2-efbb65ce634b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OrderOrProductionBacklogMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:to="loc_us-gaap_OrderOrProductionBacklogMember_019dfe77-3b04-73ee-8bf2-efbb65ce634b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DevelopedTechnologyMember_019dfe77-3b04-7eff-94ea-2c1c5ff59c00" xlink:href="revv-20260405.xsd#revv_DevelopedTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7cc0-a198-46ef202a911e" xlink:to="loc_revv_DevelopedTechnologyMember_019dfe77-3b04-7eff-94ea-2c1c5ff59c00" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7e3e-83b3-db784bde92e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7e3e-83b3-db784bde92e4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7e3e-83b3-db784bde92e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7e3e-83b3-db784bde92e4" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7e3e-83b3-db784bde92e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7d31-9f69-85fc6003c110" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7e3e-83b3-db784bde92e4" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7d31-9f69-85fc6003c110" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3b04-7df9-90a6-8d176ebbfffd" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3b04-7d31-9f69-85fc6003c110" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3b04-7df9-90a6-8d176ebbfffd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3b04-7130-8cd0-95061b2dd6d6" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3b04-7d31-9f69-85fc6003c110" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3b04-7130-8cd0-95061b2dd6d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiscoveryAnalyticalSolutionsMember_019dfe77-3b04-71cf-bea7-d23dad58387b" xlink:href="revv-20260405.xsd#revv_DiscoveryAnalyticalSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3b04-7d31-9f69-85fc6003c110" xlink:to="loc_revv_DiscoveryAnalyticalSolutionsMember_019dfe77-3b04-71cf-bea7-d23dad58387b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019dfe77-3b04-718c-87d2-5a2e1d73990e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:to="loc_srt_RangeAxis_019dfe77-3b04-718c-87d2-5a2e1d73990e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3b04-718c-87d2-5a2e1d73990e_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019dfe77-3b04-718c-87d2-5a2e1d73990e" xlink:to="loc_srt_RangeMember_019dfe77-3b04-718c-87d2-5a2e1d73990e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3b04-7093-862d-3a5018557a9a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019dfe77-3b04-718c-87d2-5a2e1d73990e" xlink:to="loc_srt_RangeMember_019dfe77-3b04-7093-862d-3a5018557a9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019dfe77-3b04-7ce4-a59a-6c5ac80af830" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfe77-3b04-7093-862d-3a5018557a9a" xlink:to="loc_srt_MinimumMember_019dfe77-3b04-7ce4-a59a-6c5ac80af830" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019dfe77-3b04-7fa0-bbb5-55743efc830f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfe77-3b04-7093-862d-3a5018557a9a" xlink:to="loc_srt_MaximumMember_019dfe77-3b04-7fa0-bbb5-55743efc830f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-79fd-b3a7-68679f78584b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7c47-88cd-21fc1c07e982" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-79fd-b3a7-68679f78584b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-79fd-b3a7-68679f78584b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-79fd-b3a7-68679f78584b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-79fd-b3a7-68679f78584b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7c12-8ed5-69c2d10909f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-79fd-b3a7-68679f78584b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7c12-8ed5-69c2d10909f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AdvancedChemistryDevelopmentInc.Member_019dfe77-3b04-76c1-8769-6ed5ce978202" xlink:href="revv-20260405.xsd#revv_AdvancedChemistryDevelopmentInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7c12-8ed5-69c2d10909f6" xlink:to="loc_revv_AdvancedChemistryDevelopmentInc.Member_019dfe77-3b04-76c1-8769-6ed5ce978202" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019dfe77-3b04-7411-8c60-e5259215b840" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019dfe77-3b04-7411-8c60-e5259215b840" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_019dfe77-3b04-7ffc-b252-fa28016b291d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_019dfe77-3b04-7ffc-b252-fa28016b291d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_019dfe77-3b04-762b-99bc-49f6aeccbf02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_019dfe77-3b04-762b-99bc-49f6aeccbf02" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019dfe77-3b04-79f3-9290-5ad58f74aa34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019dfe77-3b04-79f3-9290-5ad58f74aa34" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityWorkingCapitalAdjustments_019dfe77-3b04-7705-98f1-71dbace1d7fa" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityWorkingCapitalAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityWorkingCapitalAdjustments_019dfe77-3b04-7705-98f1-71dbace1d7fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019dfe77-3b04-74f3-9ccb-01ab0498cb48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019dfe77-3b04-74f3-9ccb-01ab0498cb48" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CashAcquired_019dfe77-3b04-7319-82c6-0cce47f99738" xlink:href="revv-20260405.xsd#revv_CashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_CashAcquired_019dfe77-3b04-7319-82c6-0cce47f99738" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_019dfe77-3b04-7c7a-a87c-5cda08dcf98b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_019dfe77-3b04-7c7a-a87c-5cda08dcf98b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityConsiderationPaidInCash_019dfe77-3b04-74bc-a165-b0f0f8ea7994" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityConsiderationPaidInCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityConsiderationPaidInCash_019dfe77-3b04-74bc-a165-b0f0f8ea7994" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityConsiderationPaidInCommonStock_019dfe77-3b04-7086-9cdc-2f6092af1b9a" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityConsiderationPaidInCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityConsiderationPaidInCommonStock_019dfe77-3b04-7086-9cdc-2f6092af1b9a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_019dfe77-3b04-70f2-a02b-2ee53c25d916" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_019dfe77-3b04-70f2-a02b-2ee53c25d916" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019dfe77-3b04-7ad0-943e-afab21660268" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019dfe77-3b04-7ad0-943e-afab21660268" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019dfe77-3b04-71b9-bb4f-ea30eeb36321" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019dfe77-3b04-71b9-bb4f-ea30eeb36321" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019dfe77-3b04-7098-b237-a70a76918bc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019dfe77-3b04-7098-b237-a70a76918bc1" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillOtherIncreaseDecrease_019dfe77-3b04-7571-b7bf-211362d2c104" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillOtherIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_GoodwillOtherIncreaseDecrease_019dfe77-3b04-7571-b7bf-211362d2c104" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityCashPaidIncludingWorkingCapitalAndOtherAdjustments_019dfe77-3b04-78fe-9a73-5f434d8f2cd0" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityCashPaidIncludingWorkingCapitalAndOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityCashPaidIncludingWorkingCapitalAndOtherAdjustments_019dfe77-3b04-78fe-9a73-5f434d8f2cd0" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityNumberOfEmployees_019dfe77-3b04-7931-a6d6-1f42d13c3f7f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityNumberOfEmployees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_dei_EntityNumberOfEmployees_019dfe77-3b04-7931-a6d6-1f42d13c3f7f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_019dfe77-3b04-7d46-b482-2be23c2905c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_019dfe77-3b04-7d46-b482-2be23c2905c2" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019dfe77-3b04-74e5-9e60-7199d3090468" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019dfe77-3b04-74e5-9e60-7199d3090468" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019dfe77-3b04-74d2-b954-cd89c657ae46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019dfe77-3b04-74d2-b954-cd89c657ae46" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019dfe77-3b04-7f25-8c55-6292a90b2436" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019dfe77-3b04-7f25-8c55-6292a90b2436" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NumberOfYearsInMeasurementPeriodFromAcquisitionDateToChangeUnderlyingAssumptions_019dfe77-3b04-7bda-835c-f96eeed1de66" xlink:href="revv-20260405.xsd#revv_NumberOfYearsInMeasurementPeriodFromAcquisitionDateToChangeUnderlyingAssumptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_NumberOfYearsInMeasurementPeriodFromAcquisitionDateToChangeUnderlyingAssumptions_019dfe77-3b04-7bda-835c-f96eeed1de66" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_019dfe77-3b04-7963-9dca-e850fdf4deab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_019dfe77-3b04-7963-9dca-e850fdf4deab" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue_019dfe77-3b04-752b-95ff-a5dc711f0610" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue_019dfe77-3b04-752b-95ff-a5dc711f0610" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019dfe77-3b04-753a-80a2-c399f30a31e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019dfe77-3b04-753a-80a2-c399f30a31e0" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationContingentConsiderationArrangementsMaximumPeriod_019dfe77-3b04-7910-a81a-c92170437256" xlink:href="revv-20260405.xsd#revv_BusinessCombinationContingentConsiderationArrangementsMaximumPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationContingentConsiderationArrangementsMaximumPeriod_019dfe77-3b04-7910-a81a-c92170437256" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationContingentConsiderationArrangementsWeightedAveragePeriod_019dfe77-3b04-73bd-baa7-0c62dc6cd6ae" xlink:href="revv-20260405.xsd#revv_BusinessCombinationContingentConsiderationArrangementsWeightedAveragePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationContingentConsiderationArrangementsWeightedAveragePeriod_019dfe77-3b04-73bd-baa7-0c62dc6cd6ae" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019dfe77-3b04-7ba6-950e-5735f8b0eb4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019dfe77-3b04-7ba6-950e-5735f8b0eb4e" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription_019dfe77-3b04-7f6e-9248-9e92dadcd1be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription_019dfe77-3b04-7f6e-9248-9e92dadcd1be" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019dfe77-3b04-727f-858a-34d22b0830e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019dfe77-3b04-727f-858a-34d22b0830e1" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019dfe77-3b04-70f3-bc43-c840ed9d3e47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_Goodwill_019dfe77-3b04-70f3-bc43-c840ed9d3e47" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_019dfe77-3b04-75f7-ab02-7e1ea5be51ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_019dfe77-3b04-75f7-ab02-7e1ea5be51ce" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_019dfe77-3b04-7220-acdc-dbc5fcc6b9b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_019dfe77-3b04-7220-acdc-dbc5fcc6b9b8" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_019dfe77-3b04-7c81-b504-75f3b4d88447" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_019dfe77-3b04-7c81-b504-75f3b4d88447" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionPurchasePriceAllocationCurrentAndNonCurrentLiabilitiesDeferredRevenue_019dfe77-3b04-7d08-8eee-49df6366eb33" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionPurchasePriceAllocationCurrentAndNonCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessAcquisitionPurchasePriceAllocationCurrentAndNonCurrentLiabilitiesDeferredRevenue_019dfe77-3b04-7d08-8eee-49df6366eb33" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_019dfe77-3b04-7631-946c-9b836d33a7e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_019dfe77-3b04-7631-946c-9b836d33a7e1" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019dfe77-3b04-7a94-9324-eeccbebf5f57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019dfe77-3b04-7a94-9324-eeccbebf5f57" xlink:type="arc" order="36"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_019dfe77-3b04-78fe-b3de-a5608d42f13b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_019dfe77-3b04-78fe-b3de-a5608d42f13b" xlink:type="arc" order="37"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_019dfe77-3b04-7a57-8d23-802690bf8e14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_019dfe77-3b04-7a57-8d23-802690bf8e14" xlink:type="arc" order="38"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_019dfe77-3b04-7062-b7fa-a0e07bd91f44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_019dfe77-3b04-7062-b7fa-a0e07bd91f44" xlink:type="arc" order="39"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationIncreaseDecreaseinLiabilitiesAssumed_019dfe77-3b04-7dde-acda-e7fe04c790b9" xlink:href="revv-20260405.xsd#revv_BusinessCombinationIncreaseDecreaseinLiabilitiesAssumed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationIncreaseDecreaseinLiabilitiesAssumed_019dfe77-3b04-7dde-acda-e7fe04c790b9" xlink:type="arc" order="40"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationIncreaseDecreaseinDeferredTaxLiabilities_019dfe77-3b04-7ec7-96ea-d9431eddd177" xlink:href="revv-20260405.xsd#revv_BusinessCombinationIncreaseDecreaseinDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationIncreaseDecreaseinDeferredTaxLiabilities_019dfe77-3b04-7ec7-96ea-d9431eddd177" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationIncreaseDecreaseinWorkingCapitalAdjustment_019dfe77-3b04-769c-b147-a59088eab29e" xlink:href="revv-20260405.xsd#revv_BusinessCombinationIncreaseDecreaseinWorkingCapitalAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationIncreaseDecreaseinWorkingCapitalAdjustment_019dfe77-3b04-769c-b147-a59088eab29e" xlink:type="arc" order="42"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationPaymentofStayBonus_019dfe77-3b04-73f7-9a51-f1e8aabbf890" xlink:href="revv-20260405.xsd#revv_BusinessCombinationPaymentofStayBonus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationPaymentofStayBonus_019dfe77-3b04-73f7-9a51-f1e8aabbf890" xlink:type="arc" order="43"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationRemainingStayBonusToBePaid_019dfe77-3b04-7494-bf67-905b99c01ddf" xlink:href="revv-20260405.xsd#revv_BusinessCombinationRemainingStayBonusToBePaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationRemainingStayBonusToBePaid_019dfe77-3b04-7494-bf67-905b99c01ddf" xlink:type="arc" order="44"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationIncreaseDecreaseinIntangibleAssets_019dfe77-3b04-7027-99aa-e2c9a56d3360" xlink:href="revv-20260405.xsd#revv_BusinessCombinationIncreaseDecreaseinIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationIncreaseDecreaseinIntangibleAssets_019dfe77-3b04-7027-99aa-e2c9a56d3360" xlink:type="arc" order="45"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationIncreaseDecreaseinOtherAssets_019dfe77-3b04-7b9e-a666-f3e923c2e7f5" xlink:href="revv-20260405.xsd#revv_BusinessCombinationIncreaseDecreaseinOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationIncreaseDecreaseinOtherAssets_019dfe77-3b04-7b9e-a666-f3e923c2e7f5" xlink:type="arc" order="46"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationIncreaseDecreaseinPropertyandEquipment_019dfe77-3b04-75c7-8bb8-bd6e0f54014d" xlink:href="revv-20260405.xsd#revv_BusinessCombinationIncreaseDecreaseinPropertyandEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationIncreaseDecreaseinPropertyandEquipment_019dfe77-3b04-75c7-8bb8-bd6e0f54014d" xlink:type="arc" order="47"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019dfe77-3b04-77bc-8302-7e7151200e25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019dfe77-3b04-77bc-8302-7e7151200e25" xlink:type="arc" order="48"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_019dfe77-3b04-7278-a290-e91398c909a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_InterestExpense_019dfe77-3b04-7278-a290-e91398c909a0" xlink:type="arc" order="49"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationIncreaseDecreaseinCurrentAssets_019dfe77-3b04-7539-b24d-c7b4c63aeb13" xlink:href="revv-20260405.xsd#revv_BusinessCombinationIncreaseDecreaseinCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationIncreaseDecreaseinCurrentAssets_019dfe77-3b04-7539-b24d-c7b4c63aeb13" xlink:type="arc" order="50"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_019dfe77-3b04-7de9-8d50-bd3d4141810f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_019dfe77-3b04-7de9-8d50-bd3d4141810f" xlink:type="arc" order="51"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019dfe77-3b04-723f-bec7-11d96c765b70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019dfe77-3b04-723f-bec7-11d96c765b70" xlink:type="arc" order="52"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_019dfe77-3b04-7246-935b-b48cc8022bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_019dfe77-3b04-7246-935b-b48cc8022bbd" xlink:type="arc" order="53"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019dfe77-3b04-78b4-a9ed-a7c761072a3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_019dfe77-3b04-78b4-a9ed-a7c761072a3b" xlink:type="arc" order="54"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019dfe77-3b04-737f-b6e7-dbea051c1090" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationAcquisitionRelatedCostsExcludedFromProformaIncomeLossFromContinuingOperations_019dfe77-3b04-71f2-9376-90f9ad80c3f6" xlink:href="revv-20260405.xsd#revv_BusinessCombinationAcquisitionRelatedCostsExcludedFromProformaIncomeLossFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationAcquisitionRelatedCostsExcludedFromProformaIncomeLossFromContinuingOperations_019dfe77-3b04-71f2-9376-90f9ad80c3f6" xlink:type="arc" order="56"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationBridgeFinancingAndDebtPreIssuanceHedgingCostsExcludedFromProformaIncomeLossFromContinuingOperations_019dfe77-3b04-738d-adef-0c7cbba981cd" xlink:href="revv-20260405.xsd#revv_BusinessCombinationBridgeFinancingAndDebtPreIssuanceHedgingCostsExcludedFromProformaIncomeLossFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_BusinessCombinationBridgeFinancingAndDebtPreIssuanceHedgingCostsExcludedFromProformaIncomeLossFromContinuingOperations_019dfe77-3b04-738d-adef-0c7cbba981cd" xlink:type="arc" order="57"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019dfe77-3b04-77b5-8f33-8cf369326bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019dfe77-3b04-77b5-8f33-8cf369326bb1" xlink:type="arc" order="58"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AcquisitionRelatedStockCompensationExpense_019dfe77-3b04-70eb-8a3a-c4ea9ba35413" xlink:href="revv-20260405.xsd#revv_AcquisitionRelatedStockCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_AcquisitionRelatedStockCompensationExpense_019dfe77-3b04-70eb-8a3a-c4ea9ba35413" xlink:type="arc" order="59"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_019dfe77-3b04-75da-8eb2-9a15c6d7a294" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_IncentiveAwardExpenseIncome_019dfe77-3b04-7d68-aa4e-7d1035a3b5dd" xlink:href="revv-20260405.xsd#revv_IncentiveAwardExpenseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_IncentiveAwardExpenseIncome_019dfe77-3b04-7d68-aa4e-7d1035a3b5dd" xlink:type="arc" order="61"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_GoodwillAcquisition_019dfe77-3b04-755b-bea5-f25119699fe5" xlink:href="revv-20260405.xsd#revv_GoodwillAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-7eb6-9b4f-1176143b2e45" xlink:to="loc_revv_GoodwillAcquisition_019dfe77-3b04-755b-bea5-f25119699fe5" xlink:type="arc" order="62"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/BusinessCombinationsFairValuesoftheBusinessCombinationsandAllocationsfortheAcquisitionsCompletedDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#BusinessCombinationsFairValuesoftheBusinessCombinationsandAllocationsfortheAcquisitionsCompletedDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/BusinessCombinationsFairValuesoftheBusinessCombinationsandAllocationsfortheAcquisitionsCompletedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7587-8cd4-8c0a13799ebc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7587-8cd4-8c0a13799ebc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7f70-beea-8d71a790b88a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7587-8cd4-8c0a13799ebc" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7f70-beea-8d71a790b88a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7f70-beea-8d71a790b88a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7f70-beea-8d71a790b88a" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7f70-beea-8d71a790b88a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3b04-7584-b760-53d9ee6597e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3b04-7f70-beea-8d71a790b88a" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3b04-7584-b760-53d9ee6597e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3b04-7eb5-afc5-05ac57e31ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7587-8cd4-8c0a13799ebc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3b04-7eb5-afc5-05ac57e31ec3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7eb5-afc5-05ac57e31ec3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3b04-7eb5-afc5-05ac57e31ec3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7eb5-afc5-05ac57e31ec3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3b04-7eb5-afc5-05ac57e31ec3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CoreTechnologyMember_019dfe77-3b04-787f-b2f9-835c72d57533" xlink:href="revv-20260405.xsd#revv_CoreTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:to="loc_revv_CoreTechnologyMember_019dfe77-3b04-787f-b2f9-835c72d57533" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019dfe77-3b04-7f49-a7de-1dd1c092a83d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:to="loc_us-gaap_TradeNamesMember_019dfe77-3b04-7f49-a7de-1dd1c092a83d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_019dfe77-3b04-703e-b499-5d859d00a8ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:to="loc_us-gaap_PatentsMember_019dfe77-3b04-703e-b499-5d859d00a8ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_019dfe77-3b04-774e-882c-975be053c865" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:to="loc_us-gaap_LicensingAgreementsMember_019dfe77-3b04-774e-882c-975be053c865" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019dfe77-3b04-7545-b615-266613d01b95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019dfe77-3b04-7545-b615-266613d01b95" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InProcessResearchAndDevelopmentMember_019dfe77-3b04-77f2-8c7b-b7b1bbe9b832" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InProcessResearchAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:to="loc_us-gaap_InProcessResearchAndDevelopmentMember_019dfe77-3b04-77f2-8c7b-b7b1bbe9b832" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseMember_019dfe77-3b04-7e19-b241-60d8584760f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3b04-7f98-82c3-d969b036069f" xlink:to="loc_us-gaap_LicenseMember_019dfe77-3b04-7e19-b241-60d8584760f6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-744f-80ef-a9ba58e83a5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7587-8cd4-8c0a13799ebc" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-744f-80ef-a9ba58e83a5d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-744f-80ef-a9ba58e83a5d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-744f-80ef-a9ba58e83a5d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-744f-80ef-a9ba58e83a5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7c6b-991e-bca40580cc98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3b04-744f-80ef-a9ba58e83a5d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7c6b-991e-bca40580cc98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AdvancedChemistryDevelopmentInc.Member_019dfee3-763d-78ff-bdec-7a39445439cc" xlink:href="revv-20260405.xsd#revv_AdvancedChemistryDevelopmentInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3b04-7c6b-991e-bca40580cc98" xlink:to="loc_revv_AdvancedChemistryDevelopmentInc.Member_019dfee3-763d-78ff-bdec-7a39445439cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019dfe77-3b04-7eb2-a0d4-b0aec9d15437" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019dfe77-3b04-7587-8cd4-8c0a13799ebc" xlink:to="loc_srt_CurrencyAxis_019dfe77-3b04-7eb2-a0d4-b0aec9d15437" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3b04-7eb2-a0d4-b0aec9d15437_default" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019dfe77-3b04-7eb2-a0d4-b0aec9d15437" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3b04-7eb2-a0d4-b0aec9d15437_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3b04-7175-ab97-307f7c034ede" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019dfe77-3b04-7eb2-a0d4-b0aec9d15437" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3b04-7175-ab97-307f7c034ede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019dfe77-3b04-78cf-94c1-6a17868d3b33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019dfe77-3b04-78cf-94c1-6a17868d3b33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019dfe77-3b04-7b21-997f-b7179926a64c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019dfe77-3b04-7b21-997f-b7179926a64c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019dfe77-3b04-78a5-a556-18da2bee4a2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019dfe77-3b04-78a5-a556-18da2bee4a2e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue_019dfe77-3b04-7454-b4ae-0e4eb6da1666" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue_019dfe77-3b04-7454-b4ae-0e4eb6da1666" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityWorkingCapitalAdjustments_019dfe77-3b04-7ced-aeb0-4bbca5be77d8" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityWorkingCapitalAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityWorkingCapitalAdjustments_019dfe77-3b04-7ced-aeb0-4bbca5be77d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CashAcquired_019dfe77-3b04-7ea4-a37e-207f2d5fb5cd" xlink:href="revv-20260405.xsd#revv_CashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_revv_CashAcquired_019dfe77-3b04-7ea4-a37e-207f2d5fb5cd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019dfe77-3b04-7260-a8c6-2b65dbeaf586" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019dfe77-3b04-7260-a8c6-2b65dbeaf586" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_019dfe77-3b04-7abd-a3ea-4615fd1c2ec0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_019dfe77-3b04-7abd-a3ea-4615fd1c2ec0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019dfe77-3b04-74b1-8466-95d7d80de7b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019dfe77-3b04-74b1-8466-95d7d80de7b2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019dfe77-3b04-74af-ba4d-86a074f18900" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019dfe77-3b04-74af-ba4d-86a074f18900" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019dfe77-3b04-7fc8-a63a-8dd6eb038755" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019dfe77-3b04-7fc8-a63a-8dd6eb038755" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionPurchasePriceAllocationCurrentAndNonCurrentLiabilitiesDeferredRevenue_019dfe77-3b04-7d7f-a154-eb6c5724a1e3" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionPurchasePriceAllocationCurrentAndNonCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_revv_BusinessAcquisitionPurchasePriceAllocationCurrentAndNonCurrentLiabilitiesDeferredRevenue_019dfe77-3b04-7d7f-a154-eb6c5724a1e3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019dfe77-3b04-788e-9fea-d404f2fc5a73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_Goodwill_019dfe77-3b04-788e-9fea-d404f2fc5a73" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxLiabilitiesTotal_019dfe77-3b04-7e21-b14d-ada492df56fb" xlink:href="revv-20260405.xsd#revv_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxLiabilitiesTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_revv_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxLiabilitiesTotal_019dfe77-3b04-7e21-b14d-ada492df56fb" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019dfe77-3b04-785f-a457-a5343af0d037" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019dfe77-3b04-785f-a457-a5343af0d037" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019dfe77-3b04-70af-a11b-858e047571d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019dfe77-3b04-70af-a11b-858e047571d9" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_019dfe77-3b04-7180-ad83-20e8c5c457a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_019dfe77-3b04-7180-ad83-20e8c5c457a1" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019dfe77-3b04-7760-afc4-58ae0001a214" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019dfe77-3b04-7760-afc4-58ae0001a214" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityCashPaidIncludingWorkingCapitalAndOtherAdjustments_019dfe77-3b04-79e1-ad64-bd6edea795b4" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityCashPaidIncludingWorkingCapitalAndOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019dfe77-3b04-761e-bfc5-4706fdfd6674" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityCashPaidIncludingWorkingCapitalAndOtherAdjustments_019dfe77-3b04-79e1-ad64-bd6edea795b4" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/RestructuringandRelatedActivitiesNarrativeDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#RestructuringandRelatedActivitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/RestructuringandRelatedActivitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7b5f-b8aa-e76c0bc29b35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-7d04-b5ce-49e9d07c0919" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7b5f-b8aa-e76c0bc29b35" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-7d04-b5ce-49e9d07c0919" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-75ad-aa8d-1ebd714f4508" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-7d04-b5ce-49e9d07c0919" xlink:to="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-75ad-aa8d-1ebd714f4508" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-75ad-aa8d-1ebd714f4508_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-75ad-aa8d-1ebd714f4508" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-75ad-aa8d-1ebd714f4508_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7d81-a092-6b2b4fccef97" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-75ad-aa8d-1ebd714f4508" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7d81-a092-6b2b4fccef97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-7c6b-b3ea-1f24a87d28b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-7d04-b5ce-49e9d07c0919" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-7c6b-b3ea-1f24a87d28b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7c6b-b3ea-1f24a87d28b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-7c6b-b3ea-1f24a87d28b0" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7c6b-b3ea-1f24a87d28b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75d4-be9f-ce690e545586" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-7c6b-b3ea-1f24a87d28b0" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75d4-be9f-ce690e545586" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3bc1-76ce-96f9-95e4399bc390" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75d4-be9f-ce690e545586" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3bc1-76ce-96f9-95e4399bc390" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3bc1-7499-891b-00685746d8e5" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75d4-be9f-ce690e545586" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3bc1-7499-891b-00685746d8e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiscoveryAnalyticalSolutionsMember_019dfe77-3bc1-7be3-b527-e137a8e847c7" xlink:href="revv-20260405.xsd#revv_DiscoveryAnalyticalSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75d4-be9f-ce690e545586" xlink:to="loc_revv_DiscoveryAnalyticalSolutionsMember_019dfe77-3bc1-7be3-b527-e137a8e847c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CorporateExpensesMember_019dfe77-3bc1-74e2-a26e-e7e17326ea47" xlink:href="revv-20260405.xsd#revv_CorporateExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75d4-be9f-ce690e545586" xlink:to="loc_revv_CorporateExpensesMember_019dfe77-3bc1-74e2-a26e-e7e17326ea47" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7425-b018-2b3c6cded1c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-7d04-b5ce-49e9d07c0919" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7425-b018-2b3c6cded1c2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7425-b018-2b3c6cded1c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7425-b018-2b3c6cded1c2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7425-b018-2b3c6cded1c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7167-bed1-34d92666fd85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7425-b018-2b3c6cded1c2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7167-bed1-34d92666fd85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7c7b-8588-ead51371385c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-7d04-b5ce-49e9d07c0919" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7c7b-8588-ead51371385c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7c7b-8588-ead51371385c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7c7b-8588-ead51371385c" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-7c7b-8588-ead51371385c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-703c-a539-c892fd37b715" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019dfe77-3bc1-7c7b-8588-ead51371385c" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-703c-a539-c892fd37b715" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_019dfe77-3bc1-79f0-9521-1e2a38e0a7b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-703c-a539-c892fd37b715" xlink:to="loc_us-gaap_EmployeeSeveranceMember_019dfe77-3bc1-79f0-9521-1e2a38e0a7b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FacilityRelocationMember_019dfe77-3bc1-7184-ad67-ec68ae702849" xlink:href="revv-20260405.xsd#revv_FacilityRelocationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-703c-a539-c892fd37b715" xlink:to="loc_revv_FacilityRelocationMember_019dfe77-3bc1-7184-ad67-ec68ae702849" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractTerminationMember_019dfe77-3bc1-7dc1-a301-0bda799fb967" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractTerminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019dfe77-3bc1-703c-a539-c892fd37b715" xlink:to="loc_us-gaap_ContractTerminationMember_019dfe77-3bc1-7dc1-a301-0bda799fb967" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-721a-8308-53bfce715cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019dfe77-3bc1-7d04-b5ce-49e9d07c0919" xlink:to="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-721a-8308-53bfce715cd3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-721a-8308-53bfce715cd3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-721a-8308-53bfce715cd3" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-721a-8308-53bfce715cd3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-73e9-a8a6-3aa54baf3e70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019dfe77-3bc1-721a-8308-53bfce715cd3" xlink:to="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-73e9-a8a6-3aa54baf3e70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PreviousRestructuringAndIntegrationPlansMember_019dfe77-3bc1-7578-be41-72ce992f85e6" xlink:href="revv-20260405.xsd#revv_PreviousRestructuringAndIntegrationPlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019dfe77-3bc1-73e9-a8a6-3aa54baf3e70" xlink:to="loc_revv_PreviousRestructuringAndIntegrationPlansMember_019dfe77-3bc1-7578-be41-72ce992f85e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCosts_019dfe77-3bc1-7804-8f48-b87d7be1125a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7b5f-b8aa-e76c0bc29b35" xlink:to="loc_us-gaap_RestructuringCosts_019dfe77-3bc1-7804-8f48-b87d7be1125a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherChargesIncludedInRestructuringAndOtherCosts_019dfe77-3bc1-74fe-83cc-943defac7867" xlink:href="revv-20260405.xsd#revv_OtherChargesIncludedInRestructuringAndOtherCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7b5f-b8aa-e76c0bc29b35" xlink:to="loc_revv_OtherChargesIncludedInRestructuringAndOtherCosts_019dfe77-3bc1-74fe-83cc-943defac7867" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent_019dfe77-3bc1-7e1b-a5fa-793c857091ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7b5f-b8aa-e76c0bc29b35" xlink:to="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent_019dfe77-3bc1-7e1b-a5fa-793c857091ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LeaseAbandonmentChargesIncludedInRestructuringAndOtherCosts_019dfe77-3bc1-78e5-846e-727ea8e9ca99" xlink:href="revv-20260405.xsd#revv_LeaseAbandonmentChargesIncludedInRestructuringAndOtherCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7b5f-b8aa-e76c0bc29b35" xlink:to="loc_revv_LeaseAbandonmentChargesIncludedInRestructuringAndOtherCosts_019dfe77-3bc1-78e5-846e-727ea8e9ca99" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AccelerationOfDepreciationOfFixedAssetsAndOtherCharges_019dfe77-3bc1-7de5-842d-b8d331db1b9b" xlink:href="revv-20260405.xsd#revv_AccelerationOfDepreciationOfFixedAssetsAndOtherCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7b5f-b8aa-e76c0bc29b35" xlink:to="loc_revv_AccelerationOfDepreciationOfFixedAssetsAndOtherCharges_019dfe77-3bc1-7de5-842d-b8d331db1b9b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_019dfe77-3bc1-7da9-9fc1-ab767cd28f80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019dfe77-3bc1-7b5f-b8aa-e76c0bc29b35" xlink:to="loc_us-gaap_RestructuringReserveRollForward_019dfe77-3bc1-7da9-9fc1-ab767cd28f80" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019dfe77-3bc1-7820-ae58-3d7d6435a878" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019dfe77-3bc1-7da9-9fc1-ab767cd28f80" xlink:to="loc_us-gaap_RestructuringReserve_019dfe77-3bc1-7820-ae58-3d7d6435a878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NetRestructuringChargesIncurred_019dfe77-3bc1-73a4-9216-db788e49dea3" xlink:href="revv-20260405.xsd#revv_NetRestructuringChargesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019dfe77-3bc1-7da9-9fc1-ab767cd28f80" xlink:to="loc_revv_NetRestructuringChargesIncurred_019dfe77-3bc1-73a4-9216-db788e49dea3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_019dfe77-3bc1-7bf5-be93-b2077ec7de1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019dfe77-3bc1-7da9-9fc1-ab767cd28f80" xlink:to="loc_us-gaap_PaymentsForRestructuring_019dfe77-3bc1-7bf5-be93-b2077ec7de1c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019dfe77-3bc1-7a50-bd1f-2a936de25794" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#IncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/IncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_019dfe77-3bc1-7199-b3da-3cb3b7edc497" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_019dfe77-3bc1-7199-b3da-3cb3b7edc497" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TaxAdjustmentsAxis_019dfe77-3bc1-7dbc-9e89-cf7e821159a8" xlink:href="revv-20260405.xsd#revv_TaxAdjustmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019dfe77-3bc1-7199-b3da-3cb3b7edc497" xlink:to="loc_revv_TaxAdjustmentsAxis_019dfe77-3bc1-7dbc-9e89-cf7e821159a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TaxAdjustmentsDomain_019dfe77-3bc1-7dbc-9e89-cf7e821159a8_default" xlink:href="revv-20260405.xsd#revv_TaxAdjustmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_TaxAdjustmentsAxis_019dfe77-3bc1-7dbc-9e89-cf7e821159a8" xlink:to="loc_revv_TaxAdjustmentsDomain_019dfe77-3bc1-7dbc-9e89-cf7e821159a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TaxAdjustmentsDomain_019dfe77-3bc1-7905-b4a3-e3d341551ec3" xlink:href="revv-20260405.xsd#revv_TaxAdjustmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_TaxAdjustmentsAxis_019dfe77-3bc1-7dbc-9e89-cf7e821159a8" xlink:to="loc_revv_TaxAdjustmentsDomain_019dfe77-3bc1-7905-b4a3-e3d341551ec3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A2017TaxCutsandJobsActMember_019dfe77-3bc1-79ef-b298-f56bb068951c" xlink:href="revv-20260405.xsd#revv_A2017TaxCutsandJobsActMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_TaxAdjustmentsDomain_019dfe77-3bc1-7905-b4a3-e3d341551ec3" xlink:to="loc_revv_A2017TaxCutsandJobsActMember_019dfe77-3bc1-79ef-b298-f56bb068951c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ValuationallowanceadjustmentsMember_019dfe77-3bc1-70e5-a56d-76ce835a280b" xlink:href="revv-20260405.xsd#revv_ValuationallowanceadjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_TaxAdjustmentsDomain_019dfe77-3bc1-7905-b4a3-e3d341551ec3" xlink:to="loc_revv_ValuationallowanceadjustmentsMember_019dfe77-3bc1-70e5-a56d-76ce835a280b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_InterestOnUncertainTaxPositionsMember_019dfe77-3bc1-709d-9f6a-69865b2a6495" xlink:href="revv-20260405.xsd#revv_InterestOnUncertainTaxPositionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_TaxAdjustmentsDomain_019dfe77-3bc1-7905-b4a3-e3d341551ec3" xlink:to="loc_revv_InterestOnUncertainTaxPositionsMember_019dfe77-3bc1-709d-9f6a-69865b2a6495" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ForeignTaxRateChangesMember_019dfe77-3bc1-726c-91cb-fc5ac438fdb1" xlink:href="revv-20260405.xsd#revv_ForeignTaxRateChangesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_TaxAdjustmentsDomain_019dfe77-3bc1-7905-b4a3-e3d341551ec3" xlink:to="loc_revv_ForeignTaxRateChangesMember_019dfe77-3bc1-726c-91cb-fc5ac438fdb1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_019dfe77-3bc1-7434-91b3-3c43644d5434" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019dfe77-3bc1-7199-b3da-3cb3b7edc497" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_019dfe77-3bc1-7434-91b3-3c43644d5434" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019dfe77-3bc1-7434-91b3-3c43644d5434_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019dfe77-3bc1-7434-91b3-3c43644d5434" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019dfe77-3bc1-7434-91b3-3c43644d5434_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019dfe77-3bc1-752c-b10f-5f06492f4d11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019dfe77-3bc1-7434-91b3-3c43644d5434" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019dfe77-3bc1-752c-b10f-5f06492f4d11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameAxis_019dfe77-3bc1-7711-914d-23c59139fabb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019dfe77-3bc1-7199-b3da-3cb3b7edc497" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameAxis_019dfe77-3bc1-7711-914d-23c59139fabb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_019dfe77-3bc1-7711-914d-23c59139fabb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_019dfe77-3bc1-7711-914d-23c59139fabb" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_019dfe77-3bc1-7711-914d-23c59139fabb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_019dfe77-3bc1-7614-a338-29a4772c9f6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_019dfe77-3bc1-7711-914d-23c59139fabb" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_019dfe77-3bc1-7614-a338-29a4772c9f6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodAxis_019dfe77-3bc1-793b-9733-6cf68951f15f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019dfe77-3bc1-7199-b3da-3cb3b7edc497" xlink:to="loc_us-gaap_TaxPeriodAxis_019dfe77-3bc1-793b-9733-6cf68951f15f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_019dfe77-3bc1-793b-9733-6cf68951f15f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxPeriodAxis_019dfe77-3bc1-793b-9733-6cf68951f15f" xlink:to="loc_us-gaap_TaxPeriodDomain_019dfe77-3bc1-793b-9733-6cf68951f15f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_019dfe77-3bc1-73ad-b278-241c7d9cc7e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxPeriodAxis_019dfe77-3bc1-793b-9733-6cf68951f15f" xlink:to="loc_us-gaap_TaxPeriodDomain_019dfe77-3bc1-73ad-b278-241c7d9cc7e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019dfe77-3bc1-768c-896a-c33e993bfef7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019dfe77-3bc1-768c-896a-c33e993bfef7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019dfe77-3bc1-705f-9a1d-2bb9de60231e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019dfe77-3bc1-705f-9a1d-2bb9de60231e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_019dfe77-3bc1-7d25-ae45-aa564708d170" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_019dfe77-3bc1-7d25-ae45-aa564708d170" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_019dfe77-3bc1-79d0-b4df-aa45a7335895" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_019dfe77-3bc1-79d0-b4df-aa45a7335895" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_UnrecognizedTaxBenefitsExpectedToBeResolvedWithInYear_019dfe77-3bc1-79ee-b493-f3e7c6b95787" xlink:href="revv-20260405.xsd#revv_UnrecognizedTaxBenefitsExpectedToBeResolvedWithInYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_UnrecognizedTaxBenefitsExpectedToBeResolvedWithInYear_019dfe77-3bc1-79ee-b493-f3e7c6b95787" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OpenTaxYearsByMajorTaxJurisdictionBeginDate_019dfe77-3bc1-792c-a6de-f8a3766638c9" xlink:href="revv-20260405.xsd#revv_OpenTaxYearsByMajorTaxJurisdictionBeginDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_OpenTaxYearsByMajorTaxJurisdictionBeginDate_019dfe77-3bc1-792c-a6de-f8a3766638c9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions_019dfe77-3bc1-748c-b463-1d6b5804bce4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions_019dfe77-3bc1-748c-b463-1d6b5804bce4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_019dfe77-3bc1-7d91-a56e-95352de6df6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_019dfe77-3bc1-7d91-a56e-95352de6df6a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_IncomeTaxExpenseonRepatriatedEarnings_019dfe77-3bc1-729a-8fb1-12d89b9b7d43" xlink:href="revv-20260405.xsd#revv_IncomeTaxExpenseonRepatriatedEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_IncomeTaxExpenseonRepatriatedEarnings_019dfe77-3bc1-729a-8fb1-12d89b9b7d43" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_019dfe77-3bc1-7d04-bab6-216e34c78043" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_019dfe77-3bc1-7d04-bab6-216e34c78043" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation_019dfe77-3bc1-716a-8001-bd622169ce8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation_019dfe77-3bc1-716a-8001-bd622169ce8e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ExcessIncomeTaxBenefitonStockCompensation_019dfe77-3bc1-70fe-8ea0-c70e0d7af829" xlink:href="revv-20260405.xsd#revv_ExcessIncomeTaxBenefitonStockCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_ExcessIncomeTaxBenefitonStockCompensation_019dfe77-3bc1-70fe-8ea0-c70e0d7af829" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherTaxExpenseBenefit_019dfe77-3bc1-7aa6-8add-9a5fd364f649" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_OtherTaxExpenseBenefit_019dfe77-3bc1-7aa6-8add-9a5fd364f649" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsOfForeignSubsidiaries_019dfe77-3bc1-7664-b76f-0e5c4d35eb61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UndistributedEarningsOfForeignSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_us-gaap_UndistributedEarningsOfForeignSubsidiaries_019dfe77-3bc1-7664-b76f-0e5c4d35eb61" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TaxExpenseBenefitAuditSettlement_019dfe77-3bc1-7c9f-b72d-16d28b3432e9" xlink:href="revv-20260405.xsd#revv_TaxExpenseBenefitAuditSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_TaxExpenseBenefitAuditSettlement_019dfe77-3bc1-7c9f-b72d-16d28b3432e9" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RemeasurementTaxExpense_019dfe77-3bc1-78af-8c51-604f1753edf4" xlink:href="revv-20260405.xsd#revv_RemeasurementTaxExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_RemeasurementTaxExpense_019dfe77-3bc1-78af-8c51-604f1753edf4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiscreteIncomeTaxExpenseBenefitSaleofBusiness_019dfe77-3bc1-7edc-887c-322f3218b324" xlink:href="revv-20260405.xsd#revv_DiscreteIncomeTaxExpenseBenefitSaleofBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_DiscreteIncomeTaxExpenseBenefitSaleofBusiness_019dfe77-3bc1-7edc-887c-322f3218b324" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiscreteIncomeTaxExpenseBenefitTaxElection_019dfe77-3bc1-79d3-a3d8-0e1d7db02d7a" xlink:href="revv-20260405.xsd#revv_DiscreteIncomeTaxExpenseBenefitTaxElection"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_DiscreteIncomeTaxExpenseBenefitTaxElection_019dfe77-3bc1-79d3-a3d8-0e1d7db02d7a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_USFederalReturnToProvisionAdjustments_019dfe77-3bc1-7c98-b005-5211dce8a3ac" xlink:href="revv-20260405.xsd#revv_USFederalReturnToProvisionAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_USFederalReturnToProvisionAdjustments_019dfe77-3bc1-7c98-b005-5211dce8a3ac" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiscreteIncomeTaxExpenseBenefitAccrualForForeignEarnings_019dfe77-3bc1-7090-90eb-3d38409ab324" xlink:href="revv-20260405.xsd#revv_DiscreteIncomeTaxExpenseBenefitAccrualForForeignEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019dfe77-3bc1-7447-94a5-fb25bc380bac" xlink:to="loc_revv_DiscreteIncomeTaxExpenseBenefitAccrualForForeignEarnings_019dfe77-3bc1-7090-90eb-3d38409ab324" xlink:type="arc" order="19"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/DebtDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#DebtDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/DebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019dfe77-3bc1-7a79-9ae4-7a78bddbe87f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:to="loc_srt_RangeAxis_019dfe77-3bc1-7a79-9ae4-7a78bddbe87f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3bc1-7a79-9ae4-7a78bddbe87f_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019dfe77-3bc1-7a79-9ae4-7a78bddbe87f" xlink:to="loc_srt_RangeMember_019dfe77-3bc1-7a79-9ae4-7a78bddbe87f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3bc1-7f1e-b2d8-fff442cd14e9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019dfe77-3bc1-7a79-9ae4-7a78bddbe87f" xlink:to="loc_srt_RangeMember_019dfe77-3bc1-7f1e-b2d8-fff442cd14e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019dfe77-3bc1-77f9-88dc-b3f4d58ab56b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfe77-3bc1-7f1e-b2d8-fff442cd14e9" xlink:to="loc_srt_MinimumMember_019dfe77-3bc1-77f9-88dc-b3f4d58ab56b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019dfe77-3bc1-77b8-9e3f-bbb3eaf7b6e8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfe77-3bc1-7f1e-b2d8-fff442cd14e9" xlink:to="loc_srt_MaximumMember_019dfe77-3bc1-77b8-9e3f-bbb3eaf7b6e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019dfe77-3bc1-796f-9d43-452381ac18f2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:to="loc_srt_CurrencyAxis_019dfe77-3bc1-796f-9d43-452381ac18f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-796f-9d43-452381ac18f2_default" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019dfe77-3bc1-796f-9d43-452381ac18f2" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-796f-9d43-452381ac18f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-7591-a9bd-6c1778ad2694" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019dfe77-3bc1-796f-9d43-452381ac18f2" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-7591-a9bd-6c1778ad2694" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-7e62-bfc0-50ccadafa21b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-7e62-bfc0-50ccadafa21b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7e62-bfc0-50ccadafa21b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-7e62-bfc0-50ccadafa21b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7e62-bfc0-50ccadafa21b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-72c4-aad4-913ae344dbff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-7e62-bfc0-50ccadafa21b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-72c4-aad4-913ae344dbff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dfe77-3bc1-767a-8b82-7692a7765c58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-72c4-aad4-913ae344dbff" xlink:to="loc_us-gaap_SubsequentEventMember_019dfe77-3bc1-767a-8b82-7692a7765c58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019dfe77-3bc1-78cd-8f8e-e2b343c23801" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019dfe77-3bc1-78cd-8f8e-e2b343c23801" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019dfe77-3bc1-78cd-8f8e-e2b343c23801_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019dfe77-3bc1-78cd-8f8e-e2b343c23801" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019dfe77-3bc1-78cd-8f8e-e2b343c23801_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019dfe77-3bc1-7cbe-add5-48bae456ac4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019dfe77-3bc1-78cd-8f8e-e2b343c23801" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019dfe77-3bc1-7cbe-add5-48bae456ac4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019dfe77-3bc1-7091-8013-12fc49fdf659" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019dfe77-3bc1-7cbe-add5-48bae456ac4c" xlink:to="loc_us-gaap_LineOfCreditMember_019dfe77-3bc1-7091-8013-12fc49fdf659" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMember_019dfe77-3bc1-77f0-be20-f22214e849e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019dfe77-3bc1-7cbe-add5-48bae456ac4c" xlink:to="loc_us-gaap_LongTermDebtMember_019dfe77-3bc1-77f0-be20-f22214e849e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TermLoanCreditFacilityMember_019dfe77-3bc1-7348-90dd-444d581a86eb" xlink:href="revv-20260405.xsd#revv_TermLoanCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019dfe77-3bc1-7cbe-add5-48bae456ac4c" xlink:to="loc_revv_TermLoanCreditFacilityMember_019dfe77-3bc1-7348-90dd-444d581a86eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LongTermDebtCurrentPortionMember_019dfe77-3bc1-7632-bc2c-f35ef1c7347f" xlink:href="revv-20260405.xsd#revv_LongTermDebtCurrentPortionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019dfe77-3bc1-7cbe-add5-48bae456ac4c" xlink:to="loc_revv_LongTermDebtCurrentPortionMember_019dfe77-3bc1-7632-bc2c-f35ef1c7347f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-722d-9015-40667525aedf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:to="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-722d-9015-40667525aedf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-722d-9015-40667525aedf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-722d-9015-40667525aedf" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-722d-9015-40667525aedf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-722d-9015-40667525aedf" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A255PercentSeniorUnsecuredNotesDueIn2031Member_019dfe77-3bc1-7157-9000-59003e1f2ee3" xlink:href="revv-20260405.xsd#revv_A255PercentSeniorUnsecuredNotesDueIn2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_A255PercentSeniorUnsecuredNotesDueIn2031Member_019dfe77-3bc1-7157-9000-59003e1f2ee3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A3625PercentSeniorUnsecuredNotesDueIn2051Member_019dfe77-3bc1-7435-aa47-26e078d9c93d" xlink:href="revv-20260405.xsd#revv_A3625PercentSeniorUnsecuredNotesDueIn2051Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_A3625PercentSeniorUnsecuredNotesDueIn2051Member_019dfe77-3bc1-7435-aa47-26e078d9c93d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TermLoanCreditFacility12MonthsMaturityMember_019dfe77-3bc1-7c54-bd95-ea7658541cbb" xlink:href="revv-20260405.xsd#revv_TermLoanCreditFacility12MonthsMaturityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_TermLoanCreditFacility12MonthsMaturityMember_019dfe77-3bc1-7c54-bd95-ea7658541cbb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A3.3PercentTenYearSeniorUnsecuredNotesdueinSept2029Member_019dfe77-3bc1-7804-8a10-0c68d36622fa" xlink:href="revv-20260405.xsd#revv_A3.3PercentTenYearSeniorUnsecuredNotesdueinSept2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_A3.3PercentTenYearSeniorUnsecuredNotesdueinSept2029Member_019dfe77-3bc1-7804-8a10-0c68d36622fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherDebtFacilitiesEUROIMMUNMember_019dfe77-3bc1-7a6b-b7c4-8ef72b0fd58f" xlink:href="revv-20260405.xsd#revv_OtherDebtFacilitiesEUROIMMUNMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_OtherDebtFacilitiesEUROIMMUNMember_019dfe77-3bc1-7a6b-b7c4-8ef72b0fd58f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherUnsecuredRevolvingDebtFacilitiesMember_019dfe77-3bc1-78dc-ba97-957a1d22e7e7" xlink:href="revv-20260405.xsd#revv_OtherUnsecuredRevolvingDebtFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_OtherUnsecuredRevolvingDebtFacilitiesMember_019dfe77-3bc1-78dc-ba97-957a1d22e7e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LineofCreditMaturingSeptember172024Member_019dfe77-3bc1-755a-9243-7233c064a137" xlink:href="revv-20260405.xsd#revv_LineofCreditMaturingSeptember172024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_LineofCreditMaturingSeptember172024Member_019dfe77-3bc1-755a-9243-7233c064a137" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A1.875PercentTenYearSeniorUnsecuredNotesMember_019dfe77-3bc1-7af7-b8dd-04cfb0e85a9a" xlink:href="revv-20260405.xsd#revv_A1.875PercentTenYearSeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_A1.875PercentTenYearSeniorUnsecuredNotesMember_019dfe77-3bc1-7af7-b8dd-04cfb0e85a9a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherDebtFacilitiesMember_019dfe77-3bc1-7ebb-be1f-7010f51d341c" xlink:href="revv-20260405.xsd#revv_OtherDebtFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_OtherDebtFacilitiesMember_019dfe77-3bc1-7ebb-be1f-7010f51d341c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherDebtFacilitiesCurrentMember_019dfe77-3bc1-7197-8e75-a41e029b615b" xlink:href="revv-20260405.xsd#revv_OtherDebtFacilitiesCurrentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_OtherDebtFacilitiesCurrentMember_019dfe77-3bc1-7197-8e75-a41e029b615b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherDebtFacilitiesNonCurrentMember_019dfe77-3bc1-7bbb-9061-546ed263b984" xlink:href="revv-20260405.xsd#revv_OtherDebtFacilitiesNonCurrentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_OtherDebtFacilitiesNonCurrentMember_019dfe77-3bc1-7bbb-9061-546ed263b984" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherDebtFacilitiesExcludingTheSeniorRevolvingCreditFacilityMember_019dfe77-3bc1-71cf-b490-a142924c01a8" xlink:href="revv-20260405.xsd#revv_OtherDebtFacilitiesExcludingTheSeniorRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_OtherDebtFacilitiesExcludingTheSeniorRevolvingCreditFacilityMember_019dfe77-3bc1-71cf-b490-a142924c01a8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LineOfCreditMaturingAugust242026Member_019dfe77-3bc1-7101-a664-6858e86a03bd" xlink:href="revv-20260405.xsd#revv_LineOfCreditMaturingAugust242026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_LineOfCreditMaturingAugust242026Member_019dfe77-3bc1-7101-a664-6858e86a03bd" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A0850SeniorUnsecuredNotesDue2024Member_019dfe77-3bc1-7927-b089-84420cec0152" xlink:href="revv-20260405.xsd#revv_A0850SeniorUnsecuredNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_A0850SeniorUnsecuredNotesDue2024Member_019dfe77-3bc1-7927-b089-84420cec0152" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A1900SeniorUnsecuredNotesDue2028Member_019dfe77-3bc1-7b7d-8cb1-4d3cfbfd220f" xlink:href="revv-20260405.xsd#revv_A1900SeniorUnsecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_A1900SeniorUnsecuredNotesDue2028Member_019dfe77-3bc1-7b7d-8cb1-4d3cfbfd220f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A2250SeniorUnsecuredNotesDueIn2031Member_019dfe77-3bc1-7c74-abcc-fd685959aeca" xlink:href="revv-20260405.xsd#revv_A2250SeniorUnsecuredNotesDueIn2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_A2250SeniorUnsecuredNotesDueIn2031Member_019dfe77-3bc1-7c74-abcc-fd685959aeca" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LineOfCreditMaturingJanuary72030Member_019dfe77-3bc1-7790-89c9-d50c34a3b46f" xlink:href="revv-20260405.xsd#revv_LineOfCreditMaturingJanuary72030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-76e9-8227-abfcc7c44da7" xlink:to="loc_revv_LineOfCreditMaturingJanuary72030Member_019dfe77-3bc1-7790-89c9-d50c34a3b46f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7e20-823f-5e4c796971c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7e20-823f-5e4c796971c3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e20-823f-5e4c796971c3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7e20-823f-5e4c796971c3" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e20-823f-5e4c796971c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e08-997a-2e111be18d00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7e20-823f-5e4c796971c3" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e08-997a-2e111be18d00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019dfe77-3bc1-7879-94d2-9d77d568ae26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e08-997a-2e111be18d00" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019dfe77-3bc1-7879-94d2-9d77d568ae26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RateBasisByTypeAxis_019dfe77-3bc1-7fd6-be37-eaab59e48da6" xlink:href="revv-20260405.xsd#revv_RateBasisByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019dfe77-3bc1-7b74-b203-377290b57d05" xlink:to="loc_revv_RateBasisByTypeAxis_019dfe77-3bc1-7fd6-be37-eaab59e48da6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7fd6-be37-eaab59e48da6_default" xlink:href="revv-20260405.xsd#revv_RateBasisByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_RateBasisByTypeAxis_019dfe77-3bc1-7fd6-be37-eaab59e48da6" xlink:to="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7fd6-be37-eaab59e48da6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:href="revv-20260405.xsd#revv_RateBasisByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_RateBasisByTypeAxis_019dfe77-3bc1-7fd6-be37-eaab59e48da6" xlink:to="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BaseRateOptionTwoMember_019dfe77-3bc1-7f1d-b346-01e9ea207184" xlink:href="revv-20260405.xsd#revv_BaseRateOptionTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_revv_BaseRateOptionTwoMember_019dfe77-3bc1-7f1d-b346-01e9ea207184" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BaseRateOptionThreeMember_019dfe77-3bc1-7a3d-af06-aa8205b785bc" xlink:href="revv-20260405.xsd#revv_BaseRateOptionThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_revv_BaseRateOptionThreeMember_019dfe77-3bc1-7a3d-af06-aa8205b785bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_WeightedAverageEurocurrencyInterestRateMember_019dfe77-3bc1-7a88-94be-fa43b09f6cbc" xlink:href="revv-20260405.xsd#revv_WeightedAverageEurocurrencyInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_revv_WeightedAverageEurocurrencyInterestRateMember_019dfe77-3bc1-7a88-94be-fa43b09f6cbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_EuriborRateMember_019dfe77-3bc1-77d4-8752-ff8afab8ee21" xlink:href="revv-20260405.xsd#revv_EuriborRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_revv_EuriborRateMember_019dfe77-3bc1-77d4-8752-ff8afab8ee21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_EuroCurrencyRateMember_019dfe77-3bc1-71d7-bd4e-303f4a9193e9" xlink:href="revv-20260405.xsd#revv_EuroCurrencyRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_revv_EuroCurrencyRateMember_019dfe77-3bc1-71d7-bd4e-303f4a9193e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TreasuryRateMember_019dfe77-3bc1-75a0-9b56-be2eb0cf7fb9" xlink:href="revv-20260405.xsd#revv_TreasuryRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_revv_TreasuryRateMember_019dfe77-3bc1-75a0-9b56-be2eb0cf7fb9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_WeightedAverageEffectiveEurocurrencyRateIncludingTheMarginMember_019dfe77-3bc1-7ede-bbfe-aa17ca46321e" xlink:href="revv-20260405.xsd#revv_WeightedAverageEffectiveEurocurrencyRateIncludingTheMarginMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_revv_WeightedAverageEffectiveEurocurrencyRateIncludingTheMarginMember_019dfe77-3bc1-7ede-bbfe-aa17ca46321e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FederalFundsRateMember_019dfe77-3bc1-7976-8c4b-713c4b31c564" xlink:href="revv-20260405.xsd#revv_FederalFundsRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_revv_FederalFundsRateMember_019dfe77-3bc1-7976-8c4b-713c4b31c564" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019dfe77-3bc1-7c28-8024-2b1beb1603be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RateBasisByTypeDomain_019dfe77-3bc1-7973-a51f-a7729aa388a7" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019dfe77-3bc1-7c28-8024-2b1beb1603be" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInitiationDate1_019dfe77-3bc1-7cce-930b-58100b3e43bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityInitiationDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LineOfCreditFacilityInitiationDate1_019dfe77-3bc1-7cce-930b-58100b3e43bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_019dfe77-3bc1-73b8-8415-ebf9e95c4821" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityExpirationDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationDate1_019dfe77-3bc1-73b8-8415-ebf9e95c4821" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_UnsecuredRevolvingCreditFacilityTerminationDate_019dfe77-3bc1-72af-a79e-3315a9eceb68" xlink:href="revv-20260405.xsd#revv_UnsecuredRevolvingCreditFacilityTerminationDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_UnsecuredRevolvingCreditFacilityTerminationDate_019dfe77-3bc1-72af-a79e-3315a9eceb68" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateDescription_019dfe77-3bc1-7405-83a7-91ea707d2b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityInterestRateDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateDescription_019dfe77-3bc1-7405-83a7-91ea707d2b0d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_019dfe77-3bc1-78e2-a4fc-49bda1052ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_019dfe77-3bc1-78e2-a4fc-49bda1052ee4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_019dfe77-3bc1-7762-95a8-85ec10470438" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_019dfe77-3bc1-7762-95a8-85ec10470438" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherUnsecuredRevolvingCreditFacilities_019dfe77-3bc1-7faf-adf8-f4f04f432066" xlink:href="revv-20260405.xsd#revv_OtherUnsecuredRevolvingCreditFacilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_OtherUnsecuredRevolvingCreditFacilities_019dfe77-3bc1-7faf-adf8-f4f04f432066" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019dfe77-3bc1-7a47-b38e-1eb694d71bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019dfe77-3bc1-7a47-b38e-1eb694d71bb0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019dfe77-3bc1-7784-96aa-b3789bddfd14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019dfe77-3bc1-7784-96aa-b3789bddfd14" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019dfe77-3bc1-7f83-b0dc-fe0bc57aa45b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019dfe77-3bc1-7f83-b0dc-fe0bc57aa45b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateTerms_019dfe77-3bc1-75b7-9912-9aa5478e7378" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateTerms_019dfe77-3bc1-75b7-9912-9aa5478e7378" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateBasisForEffectiveRate_019dfe77-3bc1-7894-843e-5906cca19ef3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateBasisForEffectiveRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateBasisForEffectiveRate_019dfe77-3bc1-7894-843e-5906cca19ef3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_019dfe77-3bc1-7da7-b717-1d28a533aab7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_SecuredDebt_019dfe77-3bc1-7da7-b717-1d28a533aab7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DebtInstrumentWeightedAverageInterestRateBasis_019dfe77-3bc1-7aa2-ae55-c0ab3b65276f" xlink:href="revv-20260405.xsd#revv_DebtInstrumentWeightedAverageInterestRateBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_DebtInstrumentWeightedAverageInterestRateBasis_019dfe77-3bc1-7aa2-ae55-c0ab3b65276f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019dfe77-3bc1-7528-ac1a-edeec6bdae8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019dfe77-3bc1-7528-ac1a-edeec6bdae8f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtPercentageBearingVariableInterestAmount_019dfe77-3bc1-71a6-b6de-1c6496503fcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtPercentageBearingVariableInterestAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LongtermDebtPercentageBearingVariableInterestAmount_019dfe77-3bc1-71a6-b6de-1c6496503fcd" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_019dfe77-3bc1-7ce2-ae69-925d3a7460fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfUnsecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_019dfe77-3bc1-7ce2-ae69-925d3a7460fe" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DebtInstrumentIssuanceAsPercentageOfPrincipalAmount_019dfe77-3bc1-7b07-bd51-79a8362c1759" xlink:href="revv-20260405.xsd#revv_DebtInstrumentIssuanceAsPercentageOfPrincipalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_DebtInstrumentIssuanceAsPercentageOfPrincipalAmount_019dfe77-3bc1-7b07-bd51-79a8362c1759" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_019dfe77-3bc1-7545-a8af-713d50ad7e74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_019dfe77-3bc1-7545-a8af-713d50ad7e74" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DebtInstrumentRedemptionPercentageUponChangeOfControlAndDowngradeOfDebtInstrument_019dfe77-3bc1-721b-b28d-19ada3f2db5b" xlink:href="revv-20260405.xsd#revv_DebtInstrumentRedemptionPercentageUponChangeOfControlAndDowngradeOfDebtInstrument"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_DebtInstrumentRedemptionPercentageUponChangeOfControlAndDowngradeOfDebtInstrument_019dfe77-3bc1-721b-b28d-19ada3f2db5b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_InitialFairValueOfOtherLongTermDebtRelatedToFinancingLeaseObligations_019dfe77-3bc1-76b8-a8c8-486a80bc6f29" xlink:href="revv-20260405.xsd#revv_InitialFairValueOfOtherLongTermDebtRelatedToFinancingLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_InitialFairValueOfOtherLongTermDebtRelatedToFinancingLeaseObligations_019dfe77-3bc1-76b8-a8c8-486a80bc6f29" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AdditionalFinancingLeaseObligationsfundedbylessors_019dfe77-3bc1-74c2-85a9-61caa1f3f465" xlink:href="revv-20260405.xsd#revv_AdditionalFinancingLeaseObligationsfundedbylessors"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_AdditionalFinancingLeaseObligationsfundedbylessors_019dfe77-3bc1-74c2-85a9-61caa1f3f465" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebtCurrent_019dfe77-3bc1-708b-b607-85a974d9c3a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_OtherLongTermDebtCurrent_019dfe77-3bc1-708b-b607-85a974d9c3a2" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_019dfe77-3bc1-72ba-a402-6d09f17f5935" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_OtherLongTermDebtNoncurrent_019dfe77-3bc1-72ba-a402-6d09f17f5935" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019dfe77-3bc1-783f-a595-a95611a99075" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LongTermDebt_019dfe77-3bc1-783f-a595-a95611a99075" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_019dfe77-3bc1-75a9-8346-6b6bf6159297" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_019dfe77-3bc1-75a9-8346-6b6bf6159297" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CurrentPortionOfLongTermDebtGross_019dfe77-3bc1-7423-8156-cbf7b6b020ae" xlink:href="revv-20260405.xsd#revv_CurrentPortionOfLongTermDebtGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_CurrentPortionOfLongTermDebtGross_019dfe77-3bc1-7423-8156-cbf7b6b020ae" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019dfe77-3bc1-7055-bd5e-50f3ff41fa6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LongTermDebtCurrent_019dfe77-3bc1-7055-bd5e-50f3ff41fa6f" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_019dfe77-3bc1-7bc0-9d3d-eaab63e67e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_019dfe77-3bc1-7bc0-9d3d-eaab63e67e2d" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TermLoanCreditFacilityMaximumBorrowingCapacity_019dfe77-3bc1-79e4-ae24-816146207805" xlink:href="revv-20260405.xsd#revv_TermLoanCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_TermLoanCreditFacilityMaximumBorrowingCapacity_019dfe77-3bc1-79e4-ae24-816146207805" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DebtRedemptionPretaxNonoperatingCharges_019dfe77-3bc1-7dc1-aa58-456dcc1d7347" xlink:href="revv-20260405.xsd#revv_DebtRedemptionPretaxNonoperatingCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_DebtRedemptionPretaxNonoperatingCharges_019dfe77-3bc1-7dc1-aa58-456dcc1d7347" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DebtRedemptionMakewhole_019dfe77-3bc1-7957-a910-0ca010ac93bb" xlink:href="revv-20260405.xsd#revv_DebtRedemptionMakewhole"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_DebtRedemptionMakewhole_019dfe77-3bc1-7957-a910-0ca010ac93bb" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DebtRedemptionDeferredcostsandOriginalIssueDiscount_019dfe77-3bc1-7fd2-aa95-383e23f4f1ea" xlink:href="revv-20260405.xsd#revv_DebtRedemptionDeferredcostsandOriginalIssueDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_DebtRedemptionDeferredcostsandOriginalIssueDiscount_019dfe77-3bc1-7fd2-aa95-383e23f4f1ea" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019dfe77-3bc1-7151-a580-273e6e723714" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_LineOfCredit_019dfe77-3bc1-7151-a580-273e6e723714" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019dfe77-3bc1-70d0-bd35-d9b042e65f6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019dfe77-3bc1-70d0-bd35-d9b042e65f6a" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_EurocurrencyMarginBasisPoint_019dfe77-3bc1-793d-8b1e-11e7d7f15355" xlink:href="revv-20260405.xsd#revv_EurocurrencyMarginBasisPoint"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_EurocurrencyMarginBasisPoint_019dfe77-3bc1-793d-8b1e-11e7d7f15355" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RepaymentsOfTermLoan_019dfe77-3bc1-78c0-b05b-2dbf6d055b7c" xlink:href="revv-20260405.xsd#revv_RepaymentsOfTermLoan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_RepaymentsOfTermLoan_019dfe77-3bc1-78c0-b05b-2dbf6d055b7c" xlink:type="arc" order="36"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019dfe77-3bc1-7df2-9ff0-e93ea16ff48b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019dfe77-3bc1-7df2-9ff0-e93ea16ff48b" xlink:type="arc" order="37"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CarryingValueOfInvestmentsInUSTreasurySecuritiesMeasuredAtAmortizedCostHeldToMaturity_019dfe77-3bc1-71a2-9f0b-398014f3e27d" xlink:href="revv-20260405.xsd#revv_CarryingValueOfInvestmentsInUSTreasurySecuritiesMeasuredAtAmortizedCostHeldToMaturity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_revv_CarryingValueOfInvestmentsInUSTreasurySecuritiesMeasuredAtAmortizedCostHeldToMaturity_019dfe77-3bc1-71a2-9f0b-398014f3e27d" xlink:type="arc" order="38"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019dfe77-3bc1-7565-8fac-65b860afbc40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019dfe77-3bc1-7565-8fac-65b860afbc40" xlink:type="arc" order="39"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_019dfe77-3bc1-7963-8441-d54151e950e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dfe77-3bc1-74ba-b810-f7a24829fbd4" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_019dfe77-3bc1-7963-8441-d54151e950e7" xlink:type="arc" order="40"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/IndustrySegmentInformationIndustrySegmentInformationNarrativeDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#IndustrySegmentInformationIndustrySegmentInformationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/IndustrySegmentInformationIndustrySegmentInformationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7cbb-b4d1-d558ea4296c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7d3b-b846-ed5045c95307" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7cbb-b4d1-d558ea4296c5" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7d3b-b846-ed5045c95307" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7752-b04f-eafa14d95208" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7d3b-b846-ed5045c95307" xlink:to="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7752-b04f-eafa14d95208" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7752-b04f-eafa14d95208_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7752-b04f-eafa14d95208" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-7752-b04f-eafa14d95208_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-768e-bf55-a825dc721710" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019dfe77-3bc1-7752-b04f-eafa14d95208" xlink:to="loc_srt_ConsolidationItemsDomain_019dfe77-3bc1-768e-bf55-a825dc721710" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-7efe-8ac1-f1c694d9afa1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7d3b-b846-ed5045c95307" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-7efe-8ac1-f1c694d9afa1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7efe-8ac1-f1c694d9afa1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-7efe-8ac1-f1c694d9afa1" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7efe-8ac1-f1c694d9afa1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-731f-b5f0-9c2934bde8cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-7efe-8ac1-f1c694d9afa1" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-731f-b5f0-9c2934bde8cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_019dfe77-3bc1-7e09-9e18-68f26ca807c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7d3b-b846-ed5045c95307" xlink:to="loc_us-gaap_SubsegmentsAxis_019dfe77-3bc1-7e09-9e18-68f26ca807c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019dfe77-3bc1-7e09-9e18-68f26ca807c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_019dfe77-3bc1-7e09-9e18-68f26ca807c7" xlink:to="loc_us-gaap_SubsegmentsDomain_019dfe77-3bc1-7e09-9e18-68f26ca807c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019dfe77-3bc1-71e4-80e6-e08ef17af862" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_019dfe77-3bc1-7e09-9e18-68f26ca807c7" xlink:to="loc_us-gaap_SubsegmentsDomain_019dfe77-3bc1-71e4-80e6-e08ef17af862" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsAxis_019dfe77-3bc1-76c3-bed3-5688a0756692" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7d3b-b846-ed5045c95307" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsAxis_019dfe77-3bc1-76c3-bed3-5688a0756692" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsDomain_019dfe77-3bc1-76c3-bed3-5688a0756692_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsAxis_019dfe77-3bc1-76c3-bed3-5688a0756692" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsDomain_019dfe77-3bc1-76c3-bed3-5688a0756692_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsDomain_019dfe77-3bc1-76c7-a5c1-011e3fc8511a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsAxis_019dfe77-3bc1-76c3-bed3-5688a0756692" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsDomain_019dfe77-3bc1-76c7-a5c1-011e3fc8511a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_019dfe77-3bc1-7d35-8b5e-0a938b714004" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7cbb-b4d1-d558ea4296c5" xlink:to="loc_us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_019dfe77-3bc1-7d35-8b5e-0a938b714004" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_019dfe77-3bc1-7e7a-9d64-1bbe5d88abaa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7cbb-b4d1-d558ea4296c5" xlink:to="loc_us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_019dfe77-3bc1-7e7a-9d64-1bbe5d88abaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019dfe77-3bc1-78ab-a230-15d5af686ea0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7cbb-b4d1-d558ea4296c5" xlink:to="loc_us-gaap_NumberOfReportableSegments_019dfe77-3bc1-78ab-a230-15d5af686ea0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/IndustrySegmentInformationScheduleofSalesandOperatingIncomebyOperatingSegmentExcludingDiscontinuedOperationsDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#IndustrySegmentInformationScheduleofSalesandOperatingIncomebyOperatingSegmentExcludingDiscontinuedOperationsDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/IndustrySegmentInformationScheduleofSalesandOperatingIncomebyOperatingSegmentExcludingDiscontinuedOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7e39-a668-fec2e7605319" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7e39-a668-fec2e7605319" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RevenuePurchaseAccountingAdjustmentsAxis_019dfe77-3bc1-7bcf-b416-2dc5cd5d5758" xlink:href="revv-20260405.xsd#revv_RevenuePurchaseAccountingAdjustmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7e39-a668-fec2e7605319" xlink:to="loc_revv_RevenuePurchaseAccountingAdjustmentsAxis_019dfe77-3bc1-7bcf-b416-2dc5cd5d5758" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RevenuePurchaseAccountingAdjustmentsDomain_019dfe77-3bc1-7bcf-b416-2dc5cd5d5758_default" xlink:href="revv-20260405.xsd#revv_RevenuePurchaseAccountingAdjustmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_RevenuePurchaseAccountingAdjustmentsAxis_019dfe77-3bc1-7bcf-b416-2dc5cd5d5758" xlink:to="loc_revv_RevenuePurchaseAccountingAdjustmentsDomain_019dfe77-3bc1-7bcf-b416-2dc5cd5d5758_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RevenuePurchaseAccountingAdjustmentsDomain_019dfe77-3bc1-737c-b08e-f3af3e939982" xlink:href="revv-20260405.xsd#revv_RevenuePurchaseAccountingAdjustmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_RevenuePurchaseAccountingAdjustmentsAxis_019dfe77-3bc1-7bcf-b416-2dc5cd5d5758" xlink:to="loc_revv_RevenuePurchaseAccountingAdjustmentsDomain_019dfe77-3bc1-737c-b08e-f3af3e939982" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RevenuePurchaseAccountingAdjustmentsMember_019dfe77-3bc1-7823-8dc3-8c91282316e7" xlink:href="revv-20260405.xsd#revv_RevenuePurchaseAccountingAdjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_RevenuePurchaseAccountingAdjustmentsDomain_019dfe77-3bc1-737c-b08e-f3af3e939982" xlink:to="loc_revv_RevenuePurchaseAccountingAdjustmentsMember_019dfe77-3bc1-7823-8dc3-8c91282316e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SegmentReportingAxis_019dfe77-3bc1-7bcf-93ae-27736356771c" xlink:href="revv-20260405.xsd#revv_SegmentReportingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7e39-a668-fec2e7605319" xlink:to="loc_revv_SegmentReportingAxis_019dfe77-3bc1-7bcf-93ae-27736356771c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SegmentReportingDomain_019dfe77-3bc1-7bcf-93ae-27736356771c_default" xlink:href="revv-20260405.xsd#revv_SegmentReportingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_SegmentReportingAxis_019dfe77-3bc1-7bcf-93ae-27736356771c" xlink:to="loc_revv_SegmentReportingDomain_019dfe77-3bc1-7bcf-93ae-27736356771c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SegmentReportingDomain_019dfe77-3bc1-7202-a828-a45e9e7cce8e" xlink:href="revv-20260405.xsd#revv_SegmentReportingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_SegmentReportingAxis_019dfe77-3bc1-7bcf-93ae-27736356771c" xlink:to="loc_revv_SegmentReportingDomain_019dfe77-3bc1-7202-a828-a45e9e7cce8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ReportableSegmentRevenueMember_019dfe77-3bc1-72e9-a7e0-646f68c24e96" xlink:href="revv-20260405.xsd#revv_ReportableSegmentRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_SegmentReportingDomain_019dfe77-3bc1-7202-a828-a45e9e7cce8e" xlink:to="loc_revv_ReportableSegmentRevenueMember_019dfe77-3bc1-72e9-a7e0-646f68c24e96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SegmentOperatingIncomeMember_019dfe77-3bc1-70a7-8ab4-b353046e7d1a" xlink:href="revv-20260405.xsd#revv_SegmentOperatingIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_SegmentReportingDomain_019dfe77-3bc1-7202-a828-a45e9e7cce8e" xlink:to="loc_revv_SegmentOperatingIncomeMember_019dfe77-3bc1-70a7-8ab4-b353046e7d1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ReconcilingItemToReconcileSegmentOperatingIncomeToIncomeFromContinuingOperationsBeforeIncomeTaxesMember_019dfe77-3bc1-7b4f-9815-95ea84a3965c" xlink:href="revv-20260405.xsd#revv_ReconcilingItemToReconcileSegmentOperatingIncomeToIncomeFromContinuingOperationsBeforeIncomeTaxesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_SegmentReportingDomain_019dfe77-3bc1-7202-a828-a45e9e7cce8e" xlink:to="loc_revv_ReconcilingItemToReconcileSegmentOperatingIncomeToIncomeFromContinuingOperationsBeforeIncomeTaxesMember_019dfe77-3bc1-7b4f-9815-95ea84a3965c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-76c7-be63-ebd7c0324169" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7e39-a668-fec2e7605319" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-76c7-be63-ebd7c0324169" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-76c7-be63-ebd7c0324169_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-76c7-be63-ebd7c0324169" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-76c7-be63-ebd7c0324169_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75a8-b6f8-8e57fd6d8bff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-76c7-be63-ebd7c0324169" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75a8-b6f8-8e57fd6d8bff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_HumanHealthMember_019dfe77-3bc1-7f02-bc2c-fe5865fc5c3e" xlink:href="revv-20260405.xsd#revv_HumanHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75a8-b6f8-8e57fd6d8bff" xlink:to="loc_revv_HumanHealthMember_019dfe77-3bc1-7f02-bc2c-fe5865fc5c3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_EnvironmentalHealthMember_019dfe77-3bc1-7c58-a384-dd1643fefe23" xlink:href="revv-20260405.xsd#revv_EnvironmentalHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75a8-b6f8-8e57fd6d8bff" xlink:to="loc_revv_EnvironmentalHealthMember_019dfe77-3bc1-7c58-a384-dd1643fefe23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateMember_019dfe77-3bc1-7b0c-8bd6-e3f1b354abb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75a8-b6f8-8e57fd6d8bff" xlink:to="loc_us-gaap_CorporateMember_019dfe77-3bc1-7b0c-8bd6-e3f1b354abb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3bc1-7c8e-918b-4addc82c435b" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75a8-b6f8-8e57fd6d8bff" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3bc1-7c8e-918b-4addc82c435b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiscoveryAnalyticalSolutionsMember_019dfe77-3bc1-7496-8bfb-e6748d458674" xlink:href="revv-20260405.xsd#revv_DiscoveryAnalyticalSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75a8-b6f8-8e57fd6d8bff" xlink:to="loc_revv_DiscoveryAnalyticalSolutionsMember_019dfe77-3bc1-7496-8bfb-e6748d458674" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3bc1-7c82-84f5-e3cb74e0e4e1" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-75a8-b6f8-8e57fd6d8bff" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3bc1-7c82-84f5-e3cb74e0e4e1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019dfe77-3bc1-7dbc-ac6c-0dd80de5f7d5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019dfe77-3bc1-7e39-a668-fec2e7605319" xlink:to="loc_srt_ProductOrServiceAxis_019dfe77-3bc1-7dbc-ac6c-0dd80de5f7d5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019dfe77-3bc1-7dbc-ac6c-0dd80de5f7d5_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019dfe77-3bc1-7dbc-ac6c-0dd80de5f7d5" xlink:to="loc_srt_ProductsAndServicesDomain_019dfe77-3bc1-7dbc-ac6c-0dd80de5f7d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019dfe77-3bc1-795e-9b9e-f12b772468db" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019dfe77-3bc1-7dbc-ac6c-0dd80de5f7d5" xlink:to="loc_srt_ProductsAndServicesDomain_019dfe77-3bc1-795e-9b9e-f12b772468db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_019dfe77-3bc1-74f6-b7e2-04f69802f2e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019dfe77-3bc1-795e-9b9e-f12b772468db" xlink:to="loc_us-gaap_ProductMember_019dfe77-3bc1-74f6-b7e2-04f69802f2e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_019dfe77-3bc1-7449-86ce-2e3dc9d5b1fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019dfe77-3bc1-795e-9b9e-f12b772468db" xlink:to="loc_us-gaap_ServiceMember_019dfe77-3bc1-7449-86ce-2e3dc9d5b1fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dfe77-3bc1-7bf4-bf88-b4fe6934ba56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dfe77-3bc1-7bf4-bf88-b4fe6934ba56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SegmentCostOfRevenue_019dfe77-3bc1-7aeb-9ea2-94196541a2cd" xlink:href="revv-20260405.xsd#revv_SegmentCostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_revv_SegmentCostOfRevenue_019dfe77-3bc1-7aeb-9ea2-94196541a2cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SegmentSellingGeneralAndAdministrativeExpenses_019dfe77-3bc1-7db9-8546-b4a39bf8443f" xlink:href="revv-20260405.xsd#revv_SegmentSellingGeneralAndAdministrativeExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_revv_SegmentSellingGeneralAndAdministrativeExpenses_019dfe77-3bc1-7db9-8546-b4a39bf8443f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SegmentResearchAndDevelopmentExpenses_019dfe77-3bc1-7bae-85e0-3eb934cc7c4a" xlink:href="revv-20260405.xsd#revv_SegmentResearchAndDevelopmentExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_revv_SegmentResearchAndDevelopmentExpenses_019dfe77-3bc1-7bae-85e0-3eb934cc7c4a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SegmentOperatingIncome_019dfe77-3bc1-7656-a98a-36d363d307ce" xlink:href="revv-20260405.xsd#revv_SegmentOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_revv_SegmentOperatingIncome_019dfe77-3bc1-7656-a98a-36d363d307ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CorporateExpenses_019dfe77-3bc1-782d-871f-73e4ff94ea8a" xlink:href="revv-20260405.xsd#revv_CorporateExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_revv_CorporateExpenses_019dfe77-3bc1-782d-871f-73e4ff94ea8a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019dfe77-3bc1-7f4b-816f-86fc52180fe3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019dfe77-3bc1-7f4b-816f-86fc52180fe3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019dfe77-3bc1-7184-8fca-e5d0b696b30c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_OperatingIncomeLoss_019dfe77-3bc1-7184-8fca-e5d0b696b30c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PurchaseAccountingAdjustments_019dfe77-3bc1-7217-a5d8-555e8ff72578" xlink:href="revv-20260405.xsd#revv_PurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_revv_PurchaseAccountingAdjustments_019dfe77-3bc1-7217-a5d8-555e8ff72578" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019dfe77-3bc1-78e3-9470-6a9ee07e3d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019dfe77-3bc1-78e3-9470-6a9ee07e3d8a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_019dfe77-3bc1-7283-8fdc-46c7632bc1e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_AssetImpairmentCharges_019dfe77-3bc1-7283-8fdc-46c7632bc1e6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementExpense_019dfe77-3bc1-73c3-9d3b-2fb501e25aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LitigationSettlementExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_LitigationSettlementExpense_019dfe77-3bc1-73c3-9d3b-2fb501e25aa0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationExpense_019dfe77-3bc1-7a2c-8ab1-710e0ae2c5b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRemediationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_EnvironmentalRemediationExpense_019dfe77-3bc1-7a2c-8ab1-710e0ae2c5b1" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019dfe77-3bc1-7d0f-b918-ffccc81dd3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_RestructuringCharges_019dfe77-3bc1-7d0f-b918-ffccc81dd3e9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019dfe77-3bc1-7276-bdc3-07f3efd2c08e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019dfe77-3bc1-7276-bdc3-07f3efd2c08e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019dfe77-3bc1-7969-b676-a3243b3629b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019dfe77-3bc1-7969-b676-a3243b3629b3" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SignificantEnvironmentalMatters_019dfe77-3bc1-7652-a386-42a627d787b1" xlink:href="revv-20260405.xsd#revv_SignificantEnvironmentalMatters"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_revv_SignificantEnvironmentalMatters_019dfe77-3bc1-7652-a386-42a627d787b1" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TransformationCosts_019dfe77-3bc1-79c0-8e9a-421890d2590e" xlink:href="revv-20260405.xsd#revv_TransformationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_revv_TransformationCosts_019dfe77-3bc1-79c0-8e9a-421890d2590e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_019dfe77-3bc1-7356-88da-7be0b3e594d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-7a57-a7bf-a8546607c6fd" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_019dfe77-3bc1-7356-88da-7be0b3e594d4" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/IndustrySegmentandGeographicAreaInformationScheduleofDepreciationDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#IndustrySegmentandGeographicAreaInformationScheduleofDepreciationDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/IndustrySegmentandGeographicAreaInformationScheduleofDepreciationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-75f4-b2d3-250fbacf6af3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ScheduleOfDepreciationAmortizationAndCapitalExpendituresTable_019dfe77-3bc1-7dd8-a7a0-89912dcc034e" xlink:href="revv-20260405.xsd#revv_ScheduleOfDepreciationAmortizationAndCapitalExpendituresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-75f4-b2d3-250fbacf6af3" xlink:to="loc_revv_ScheduleOfDepreciationAmortizationAndCapitalExpendituresTable_019dfe77-3bc1-7dd8-a7a0-89912dcc034e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-756e-930d-36b3dd130810" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_ScheduleOfDepreciationAmortizationAndCapitalExpendituresTable_019dfe77-3bc1-7dd8-a7a0-89912dcc034e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-756e-930d-36b3dd130810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-756e-930d-36b3dd130810_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-756e-930d-36b3dd130810" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-756e-930d-36b3dd130810_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7e8e-9fe3-6ae282e9f2ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-756e-930d-36b3dd130810" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7e8e-9fe3-6ae282e9f2ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3bc1-7a1e-beb0-f047886445e6" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7e8e-9fe3-6ae282e9f2ea" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3bc1-7a1e-beb0-f047886445e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3bc1-77a8-abd1-520583a2c839" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7e8e-9fe3-6ae282e9f2ea" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3bc1-77a8-abd1-520583a2c839" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CorporateReconcilingItemMember_019dfe77-3bc1-7bb3-9af4-6e87548d6130" xlink:href="revv-20260405.xsd#revv_CorporateReconcilingItemMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7e8e-9fe3-6ae282e9f2ea" xlink:to="loc_revv_CorporateReconcilingItemMember_019dfe77-3bc1-7bb3-9af4-6e87548d6130" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019dfe77-3bc1-700c-987f-f3098847d76d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019dfe77-3bc1-75f4-b2d3-250fbacf6af3" xlink:to="loc_us-gaap_Depreciation_019dfe77-3bc1-700c-987f-f3098847d76d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/StockholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#StockholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:href="revv-20260405.xsd#revv_ScheduleofShareholdersEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ScheduleofShareholdersEquityTable_019dfe77-3bc1-79f9-b32c-9e31d61a32a0" xlink:href="revv-20260405.xsd#revv_ScheduleofShareholdersEquityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_revv_ScheduleofShareholdersEquityTable_019dfe77-3bc1-79f9-b32c-9e31d61a32a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-70ed-b482-c8781d629551" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_ScheduleofShareholdersEquityTable_019dfe77-3bc1-79f9-b32c-9e31d61a32a0" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-70ed-b482-c8781d629551" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-70ed-b482-c8781d629551_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-70ed-b482-c8781d629551" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-70ed-b482-c8781d629551_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-79a4-96f4-41cb7d115837" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-70ed-b482-c8781d629551" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-79a4-96f4-41cb7d115837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dfe77-3bc1-7e0e-b8c8-49e4b9e05857" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-79a4-96f4-41cb7d115837" xlink:to="loc_us-gaap_SubsequentEventMember_019dfe77-3bc1-7e0e-b8c8-49e4b9e05857" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019dfe77-3bc1-72de-b29f-a9fb276419f7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_ScheduleofShareholdersEquityTable_019dfe77-3bc1-79f9-b32c-9e31d61a32a0" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019dfe77-3bc1-72de-b29f-a9fb276419f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019dfe77-3bc1-72de-b29f-a9fb276419f7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019dfe77-3bc1-72de-b29f-a9fb276419f7" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019dfe77-3bc1-72de-b29f-a9fb276419f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019dfe77-3bc1-7738-81bb-c887825f15bf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019dfe77-3bc1-72de-b29f-a9fb276419f7" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019dfe77-3bc1-7738-81bb-c887825f15bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RepurchaseProgram10232025Member_019dfe77-3bc1-7539-974f-487073025b7c" xlink:href="revv-20260405.xsd#revv_RepurchaseProgram10232025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019dfe77-3bc1-7738-81bb-c887825f15bf" xlink:to="loc_revv_RepurchaseProgram10232025Member_019dfe77-3bc1-7539-974f-487073025b7c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7f14-b32a-c8b7a45b2fad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_ScheduleofShareholdersEquityTable_019dfe77-3bc1-79f9-b32c-9e31d61a32a0" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7f14-b32a-c8b7a45b2fad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7f14-b32a-c8b7a45b2fad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7f14-b32a-c8b7a45b2fad" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7f14-b32a-c8b7a45b2fad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7e5c-9af8-2c303aead959" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7f14-b32a-c8b7a45b2fad" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7e5c-9af8-2c303aead959" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember_019dfe77-3bc1-7eb7-bb71-a1c119cc68d9" xlink:href="revv-20260405.xsd#revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7e5c-9af8-2c303aead959" xlink:to="loc_revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember_019dfe77-3bc1-7eb7-bb71-a1c119cc68d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsAxis_019dfe77-3bc1-7d14-82ca-56b75457dcb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_ScheduleofShareholdersEquityTable_019dfe77-3bc1-79f9-b32c-9e31d61a32a0" xlink:to="loc_us-gaap_DividendsAxis_019dfe77-3bc1-7d14-82ca-56b75457dcb5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_019dfe77-3bc1-7d14-82ca-56b75457dcb5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DividendsAxis_019dfe77-3bc1-7d14-82ca-56b75457dcb5" xlink:to="loc_us-gaap_DividendsDomain_019dfe77-3bc1-7d14-82ca-56b75457dcb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_019dfe77-3bc1-72c4-9908-179b1829fcb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DividendsAxis_019dfe77-3bc1-7d14-82ca-56b75457dcb5" xlink:to="loc_us-gaap_DividendsDomain_019dfe77-3bc1-72c4-9908-179b1829fcb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_O2026Q1DividendsMember_019dfe77-3bc1-72b4-880b-1ec302558401" xlink:href="revv-20260405.xsd#revv_O2026Q1DividendsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_019dfe77-3bc1-72c4-9908-179b1829fcb7" xlink:to="loc_revv_O2026Q1DividendsMember_019dfe77-3bc1-72b4-880b-1ec302558401" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_O2026Q2DividendsMember_019dfe77-3bc1-7a8e-893f-0804605f94b2" xlink:href="revv-20260405.xsd#revv_O2026Q2DividendsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_019dfe77-3bc1-72c4-9908-179b1829fcb7" xlink:to="loc_revv_O2026Q2DividendsMember_019dfe77-3bc1-7a8e-893f-0804605f94b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019dfe77-3bc1-79d6-9467-564be15a32ac" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019dfe77-3bc1-79d6-9467-564be15a32ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019dfe77-3bc1-788f-91f3-8b769602f153" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019dfe77-3bc1-788f-91f3-8b769602f153" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_019dfe77-3bc1-7ec7-96ca-7050387877f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_019dfe77-3bc1-7ec7-96ca-7050387877f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_019dfe77-3bc1-77e3-bab1-354a83af7295" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_019dfe77-3bc1-77e3-bab1-354a83af7295" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_019dfe77-3bc1-78c1-a508-fb409552a86b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_019dfe77-3bc1-78c1-a508-fb409552a86b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RepurchasedCommonSharesForActivityPursuanttoEquityIncentivePlans_019dfe77-3bc1-7a61-9169-a3f17d331545" xlink:href="revv-20260405.xsd#revv_RepurchasedCommonSharesForActivityPursuanttoEquityIncentivePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_revv_RepurchasedCommonSharesForActivityPursuanttoEquityIncentivePlans_019dfe77-3bc1-7a61-9169-a3f17d331545" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AggregateCostOfRepurchasedCommonSharesUnderRepurchaseProgram_019dfe77-3bc1-75cf-b378-74e458ad3e70" xlink:href="revv-20260405.xsd#revv_AggregateCostOfRepurchasedCommonSharesUnderRepurchaseProgram"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_revv_AggregateCostOfRepurchasedCommonSharesUnderRepurchaseProgram_019dfe77-3bc1-75cf-b378-74e458ad3e70" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AggregateCostofRepurchasedCommonSharesforActivityPursuanttoEquityIncentivePlans_019dfe77-3bc1-71a7-a560-8f9488c18e2a" xlink:href="revv-20260405.xsd#revv_AggregateCostofRepurchasedCommonSharesforActivityPursuanttoEquityIncentivePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_revv_AggregateCostofRepurchasedCommonSharesforActivityPursuanttoEquityIncentivePlans_019dfe77-3bc1-71a7-a560-8f9488c18e2a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019dfe77-3bc1-74ac-8c47-430510de6a4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019dfe77-3bc1-74ac-8c47-430510de6a4f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019dfe77-3bc1-72d1-80e4-a7154cdf5f12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019dfe77-3bc1-72d1-80e4-a7154cdf5f12" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_019dfe77-3bc1-75d9-baaa-24aa79d160e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendPayableDateToBePaidDayMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_019dfe77-3bc1-75d9-baaa-24aa79d160e5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableDateDeclaredDayMonthAndYear_019dfe77-3bc1-7463-b6f8-f7fa0dcc6ef8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableDateDeclaredDayMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_DividendsPayableDateDeclaredDayMonthAndYear_019dfe77-3bc1-7463-b6f8-f7fa0dcc6ef8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableDateDeclaredMonthAndYear_019dfe77-3bc1-7c5f-abfc-0f15ad4fb613" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableDateDeclaredMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_DividendsPayableDateDeclaredMonthAndYear_019dfe77-3bc1-7c5f-abfc-0f15ad4fb613" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableDateToBePaidMonthAndYear_019dfe77-3bc1-78f3-8490-6d6537485f61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableDateToBePaidMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_us-gaap_DividendsPayableDateToBePaidMonthAndYear_019dfe77-3bc1-78f3-8490-6d6537485f61" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_UnrealizedForeignExchangeLossesGainsOnIntercompanyDebtInAOCI_019dfe77-3bc1-787a-bb5c-8039063c7d6b" xlink:href="revv-20260405.xsd#revv_UnrealizedForeignExchangeLossesGainsOnIntercompanyDebtInAOCI"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_revv_UnrealizedForeignExchangeLossesGainsOnIntercompanyDebtInAOCI_019dfe77-3bc1-787a-bb5c-8039063c7d6b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ShareRepurchaseProgramStartDate_019dfe77-3bc1-78f4-bb1a-14af399d48b2" xlink:href="revv-20260405.xsd#revv_ShareRepurchaseProgramStartDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_revv_ShareRepurchaseProgramStartDate_019dfe77-3bc1-78f4-bb1a-14af399d48b2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramExpirationDate_019dfe77-3bc1-7993-8238-02bcb62d2601" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramExpirationDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_srt_StockRepurchaseProgramExpirationDate_019dfe77-3bc1-7993-8238-02bcb62d2601" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_IncomeTaxesRelatedToForeignCurrencyTranslationAdjustmentsRecognizedInAOCI_019dfe77-3bc1-7b0d-bafa-e78509ae09ee" xlink:href="revv-20260405.xsd#revv_IncomeTaxesRelatedToForeignCurrencyTranslationAdjustmentsRecognizedInAOCI"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_ScheduleofShareholdersEquityLineItems_019dfe77-3bc1-7b75-af9e-5ea2898692fe" xlink:to="loc_revv_IncomeTaxesRelatedToForeignCurrencyTranslationAdjustmentsRecognizedInAOCI_019dfe77-3bc1-7b0d-bafa-e78509ae09ee" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/GoodwillandIntangibleAssetsNetNarrativeDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#GoodwillandIntangibleAssetsNetNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/GoodwillandIntangibleAssetsNetNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:href="revv-20260405.xsd#revv_GoodwillAndIntangibleAssetsNetLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_GoodwillAndIntangibleAssetsNetTable_019dfe77-3bc1-7805-bf71-11acd77519fc" xlink:href="revv-20260405.xsd#revv_GoodwillAndIntangibleAssetsNetTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_revv_GoodwillAndIntangibleAssetsNetTable_019dfe77-3bc1-7805-bf71-11acd77519fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-74f6-b850-557630bca985" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetTable_019dfe77-3bc1-7805-bf71-11acd77519fc" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-74f6-b850-557630bca985" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-74f6-b850-557630bca985_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-74f6-b850-557630bca985" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-74f6-b850-557630bca985_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7b6e-bdca-269392dfe9c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-74f6-b850-557630bca985" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7b6e-bdca-269392dfe9c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_MedicalImagingBusinessMember_019dfe77-3bc1-7475-b818-3e24f2cbc7a5" xlink:href="revv-20260405.xsd#revv_MedicalImagingBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7b6e-bdca-269392dfe9c0" xlink:to="loc_revv_MedicalImagingBusinessMember_019dfe77-3bc1-7475-b818-3e24f2cbc7a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitAxis_019dfe77-3bc1-7d2d-b4df-a317e7b685a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReportingUnitAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetTable_019dfe77-3bc1-7805-bf71-11acd77519fc" xlink:to="loc_us-gaap_ReportingUnitAxis_019dfe77-3bc1-7d2d-b4df-a317e7b685a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_019dfe77-3bc1-7d2d-b4df-a317e7b685a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReportingUnitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReportingUnitAxis_019dfe77-3bc1-7d2d-b4df-a317e7b685a7" xlink:to="loc_us-gaap_ReportingUnitDomain_019dfe77-3bc1-7d2d-b4df-a317e7b685a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_019dfe77-3bc1-783e-89a8-ed23d2d320f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReportingUnitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReportingUnitAxis_019dfe77-3bc1-7d2d-b4df-a317e7b685a7" xlink:to="loc_us-gaap_ReportingUnitDomain_019dfe77-3bc1-783e-89a8-ed23d2d320f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_InformaticsMember_019dfe77-3bc1-70c5-be0e-e37de868a2e9" xlink:href="revv-20260405.xsd#revv_InformaticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_019dfe77-3bc1-783e-89a8-ed23d2d320f4" xlink:to="loc_revv_InformaticsMember_019dfe77-3bc1-70c5-be0e-e37de868a2e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TulipDiagnosticsPrivateLimitedMember_019dfe77-3bc1-74ca-931f-5d15b53c7f22" xlink:href="revv-20260405.xsd#revv_TulipDiagnosticsPrivateLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_019dfe77-3bc1-783e-89a8-ed23d2d320f4" xlink:to="loc_revv_TulipDiagnosticsPrivateLimitedMember_019dfe77-3bc1-74ca-931f-5d15b53c7f22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7d3e-a5e4-a002c758c2ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetTable_019dfe77-3bc1-7805-bf71-11acd77519fc" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7d3e-a5e4-a002c758c2ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7d3e-a5e4-a002c758c2ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7d3e-a5e4-a002c758c2ea" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7d3e-a5e4-a002c758c2ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7442-b6c7-66586785d7cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7d3e-a5e4-a002c758c2ea" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7442-b6c7-66586785d7cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FiscalYear2015AcquisitionsMember_019dfe77-3bc1-7384-988e-5fb45d1cb039" xlink:href="revv-20260405.xsd#revv_FiscalYear2015AcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7442-b6c7-66586785d7cb" xlink:to="loc_revv_FiscalYear2015AcquisitionsMember_019dfe77-3bc1-7384-988e-5fb45d1cb039" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3bc1-7f93-ac25-d687d8bfac75" xlink:href="revv-20260405.xsd#revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetTable_019dfe77-3bc1-7805-bf71-11acd77519fc" xlink:to="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3bc1-7f93-ac25-d687d8bfac75" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7f93-ac25-d687d8bfac75_default" xlink:href="revv-20260405.xsd#revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3bc1-7f93-ac25-d687d8bfac75" xlink:to="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7f93-ac25-d687d8bfac75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7582-a9c4-aa75d0800faf" xlink:href="revv-20260405.xsd#revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3bc1-7f93-ac25-d687d8bfac75" xlink:to="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7582-a9c4-aa75d0800faf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_019dfe77-3bc1-7cf8-a69b-a8c66a3e50f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7582-a9c4-aa75d0800faf" xlink:to="loc_us-gaap_PatentsMember_019dfe77-3bc1-7cf8-a69b-a8c66a3e50f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TradeNamesAndTrademarksMember_019dfe77-3bc1-7c8a-996a-3c28c686adb5" xlink:href="revv-20260405.xsd#revv_TradeNamesAndTrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7582-a9c4-aa75d0800faf" xlink:to="loc_revv_TradeNamesAndTrademarksMember_019dfe77-3bc1-7c8a-996a-3c28c686adb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_019dfe77-3bc1-7349-9cba-1050e640e5fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7582-a9c4-aa75d0800faf" xlink:to="loc_us-gaap_LicensingAgreementsMember_019dfe77-3bc1-7349-9cba-1050e640e5fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CoreTechnologyMember_019dfe77-3bc1-7ad5-b563-71fd3ad981a6" xlink:href="revv-20260405.xsd#revv_CoreTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7582-a9c4-aa75d0800faf" xlink:to="loc_revv_CoreTechnologyMember_019dfe77-3bc1-7ad5-b563-71fd3ad981a6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019dfe77-3bc1-795c-9260-d5c809988ad8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7582-a9c4-aa75d0800faf" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019dfe77-3bc1-795c-9260-d5c809988ad8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InProcessResearchAndDevelopmentMember_019dfe77-3bc1-7c5e-b482-6357e3b0de99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InProcessResearchAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7582-a9c4-aa75d0800faf" xlink:to="loc_us-gaap_InProcessResearchAndDevelopmentMember_019dfe77-3bc1-7c5e-b482-6357e3b0de99" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019dfe77-3bc1-7058-8965-f01ac3e8891f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetTable_019dfe77-3bc1-7805-bf71-11acd77519fc" xlink:to="loc_srt_RangeAxis_019dfe77-3bc1-7058-8965-f01ac3e8891f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3bc1-7058-8965-f01ac3e8891f_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019dfe77-3bc1-7058-8965-f01ac3e8891f" xlink:to="loc_srt_RangeMember_019dfe77-3bc1-7058-8965-f01ac3e8891f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3bc1-7748-851e-cf157aab0a9f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019dfe77-3bc1-7058-8965-f01ac3e8891f" xlink:to="loc_srt_RangeMember_019dfe77-3bc1-7748-851e-cf157aab0a9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019dfe77-3bc1-7625-a81b-fa9b25069ba4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfe77-3bc1-7748-851e-cf157aab0a9f" xlink:to="loc_srt_MinimumMember_019dfe77-3bc1-7625-a81b-fa9b25069ba4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019dfe77-3bc1-7c53-80a7-6c95591829cd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfe77-3bc1-7748-851e-cf157aab0a9f" xlink:to="loc_srt_MaximumMember_019dfe77-3bc1-7c53-80a7-6c95591829cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019dfe77-3bc1-7a28-9fc6-5a52b92a66c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019dfe77-3bc1-7a28-9fc6-5a52b92a66c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillOtherIncreaseDecrease_019dfe77-3bc1-784a-8456-afbc8768de5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillOtherIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_GoodwillOtherIncreaseDecrease_019dfe77-3bc1-784a-8456-afbc8768de5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019dfe77-3bc1-70fd-92b2-7c63af24c38c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019dfe77-3bc1-70fd-92b2-7c63af24c38c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019dfe77-3bc1-7516-bc67-730c42c55e8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019dfe77-3bc1-7516-bc67-730c42c55e8f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_019dfe77-3bc1-730f-9ba7-669d83fcde0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_019dfe77-3bc1-730f-9ba7-669d83fcde0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LongTermTerminalGrowthRatesForReportingUnits_019dfe77-3bc1-720f-842e-cf450b589216" xlink:href="revv-20260405.xsd#revv_LongTermTerminalGrowthRatesForReportingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_revv_LongTermTerminalGrowthRatesForReportingUnits_019dfe77-3bc1-720f-842e-cf450b589216" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiscountRatesForReportingUnits_019dfe77-3bc1-7e81-abbb-4d10ab03af78" xlink:href="revv-20260405.xsd#revv_DiscountRatesForReportingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_revv_DiscountRatesForReportingUnits_019dfe77-3bc1-7e81-abbb-4d10ab03af78" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ChangeInAnyOneOfInputAssumptionsForVariousReportingUnits_019dfe77-3bc1-7bf1-8733-edeaf100f011" xlink:href="revv-20260405.xsd#revv_ChangeInAnyOneOfInputAssumptionsForVariousReportingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_revv_ChangeInAnyOneOfInputAssumptionsForVariousReportingUnits_019dfe77-3bc1-7bf1-8733-edeaf100f011" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019dfe77-3bc1-7405-bbfc-c828bff8c199" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_Goodwill_019dfe77-3bc1-7405-bbfc-c828bff8c199" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019dfe77-3bc1-7e46-b142-9fa730619b2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019dfe77-3bc1-7e46-b142-9fa730619b2f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_019dfe77-3bc1-7336-b00e-cd569839bec0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_019dfe77-3bc1-7336-b00e-cd569839bec0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_019dfe77-3bc1-7659-85eb-45204f1b9411" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_019dfe77-3bc1-7659-85eb-45204f1b9411" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_019dfe77-3bc1-79db-9761-45c997819efd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_019dfe77-3bc1-79db-9761-45c997819efd" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_019dfe77-3bc1-701c-80a0-1bb6f9852c06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_019dfe77-3bc1-701c-80a0-1bb6f9852c06" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_019dfe77-3bc1-7e0b-a9d5-0d731b6ff5d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_019dfe77-3bc1-7e0b-a9d5-0d731b6ff5d1" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_019dfe77-3bc1-7855-b09d-4d15bc04f66c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_019dfe77-3bc1-7855-b09d-4d15bc04f66c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019dfe77-3bc1-7827-89b2-5bbe0af9861e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019dfe77-3bc1-7827-89b2-5bbe0af9861e" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019dfe77-3bc1-7d82-b07d-1a76b08936bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019dfe77-3bc1-7d82-b07d-1a76b08936bf" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_019dfe77-3bc1-726d-9a53-4af32032bbb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_019dfe77-3bc1-726d-9a53-4af32032bbb7" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AnnualGoodwillImpairmentTestingDate_019dfe77-3bc1-74d6-aa18-134c76206184" xlink:href="revv-20260405.xsd#revv_AnnualGoodwillImpairmentTestingDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_revv_AnnualGoodwillImpairmentTestingDate_019dfe77-3bc1-74d6-aa18-134c76206184" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OldDateOfAnnualGoodwillImpairmentTest_019dfe77-3bc1-769a-be4b-c7d5bb90c219" xlink:href="revv-20260405.xsd#revv_OldDateOfAnnualGoodwillImpairmentTest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_GoodwillAndIntangibleAssetsNetLineItems_019dfe77-3bc1-7973-ba8a-0e00fdc6f380" xlink:to="loc_revv_OldDateOfAnnualGoodwillImpairmentTest_019dfe77-3bc1-769a-be4b-c7d5bb90c219" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/GoodwillandIntangibleAssetsNetChangesintheCarryingAmountofGoodwillDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#GoodwillandIntangibleAssetsNetChangesintheCarryingAmountofGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/GoodwillandIntangibleAssetsNetChangesintheCarryingAmountofGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019dfe77-3bc1-7de9-9939-e97e96ebd3c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019dfe77-3bc1-751c-8212-a96b63a9b3f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019dfe77-3bc1-7de9-9939-e97e96ebd3c9" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019dfe77-3bc1-751c-8212-a96b63a9b3f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-72fc-9a01-3e993c6bf0ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019dfe77-3bc1-751c-8212-a96b63a9b3f8" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-72fc-9a01-3e993c6bf0ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-72fc-9a01-3e993c6bf0ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-72fc-9a01-3e993c6bf0ae" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-72fc-9a01-3e993c6bf0ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7f21-8b17-1bda7e646dff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019dfe77-3bc1-72fc-9a01-3e993c6bf0ae" xlink:to="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7f21-8b17-1bda7e646dff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LifeSciencesMember_019dfe77-3bc1-729d-b7a8-f8ec5afbc432" xlink:href="revv-20260405.xsd#revv_LifeSciencesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7f21-8b17-1bda7e646dff" xlink:to="loc_revv_LifeSciencesMember_019dfe77-3bc1-729d-b7a8-f8ec5afbc432" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiagnosticsMember_019dfe77-3bc1-7faa-be50-89f2fbdc0631" xlink:href="revv-20260405.xsd#revv_DiagnosticsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7f21-8b17-1bda7e646dff" xlink:to="loc_revv_DiagnosticsMember_019dfe77-3bc1-7faa-be50-89f2fbdc0631" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DiscoveryAnalyticalSolutionsMember_019dfe77-3bc1-74d4-9614-fb98b5a64bc2" xlink:href="revv-20260405.xsd#revv_DiscoveryAnalyticalSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019dfe77-3bc1-7f21-8b17-1bda7e646dff" xlink:to="loc_revv_DiscoveryAnalyticalSolutionsMember_019dfe77-3bc1-74d4-9614-fb98b5a64bc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_019dfe77-3bc1-7be9-92a4-e10b5e6a45dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019dfe77-3bc1-7de9-9939-e97e96ebd3c9" xlink:to="loc_us-gaap_GoodwillRollForward_019dfe77-3bc1-7be9-92a4-e10b5e6a45dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019dfe77-3bc1-7d70-8f80-1c6607f07e87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019dfe77-3bc1-7be9-92a4-e10b5e6a45dc" xlink:to="loc_us-gaap_Goodwill_019dfe77-3bc1-7d70-8f80-1c6607f07e87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019dfe77-3bc1-7048-9bdf-92402cf0815d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019dfe77-3bc1-7be9-92a4-e10b5e6a45dc" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019dfe77-3bc1-7048-9bdf-92402cf0815d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_019dfe77-3bc1-70b4-9bee-5278a3c92b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019dfe77-3bc1-7be9-92a4-e10b5e6a45dc" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_019dfe77-3bc1-70b4-9bee-5278a3c92b8c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_GoodwillAcquisition_019dfe77-3bc1-709b-850f-2c8394b2b5b9" xlink:href="revv-20260405.xsd#revv_GoodwillAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019dfe77-3bc1-7be9-92a4-e10b5e6a45dc" xlink:to="loc_revv_GoodwillAcquisition_019dfe77-3bc1-709b-850f-2c8394b2b5b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019dfe77-3bc1-7d55-8e58-4d58db5f514a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/GoodwillandIntangibleAssetsNetIdentifiableIntangibleAssetBalancesDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#GoodwillandIntangibleAssetsNetIdentifiableIntangibleAssetBalancesDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/GoodwillandIntangibleAssetsNetIdentifiableIntangibleAssetBalancesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_019dfe77-3bc1-7e33-aee8-0da733f0baad" xlink:href="revv-20260405.xsd#revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsByMajorClassTable_019dfe77-3bc1-77c5-b53e-136cd06b0857" xlink:href="revv-20260405.xsd#revv_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsByMajorClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_019dfe77-3bc1-7e33-aee8-0da733f0baad" xlink:to="loc_revv_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsByMajorClassTable_019dfe77-3bc1-77c5-b53e-136cd06b0857" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3bc1-7c9d-8694-8a8c6e0bdcae" xlink:href="revv-20260405.xsd#revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_revv_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsByMajorClassTable_019dfe77-3bc1-77c5-b53e-136cd06b0857" xlink:to="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3bc1-7c9d-8694-8a8c6e0bdcae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7c9d-8694-8a8c6e0bdcae_default" xlink:href="revv-20260405.xsd#revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3bc1-7c9d-8694-8a8c6e0bdcae" xlink:to="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-7c9d-8694-8a8c6e0bdcae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-77bb-9ac8-c7dc2ff4aeff" xlink:href="revv-20260405.xsd#revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassAxis_019dfe77-3bc1-7c9d-8694-8a8c6e0bdcae" xlink:to="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-77bb-9ac8-c7dc2ff4aeff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_019dfe77-3bc1-7df4-a7d6-0040eb6feb02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-77bb-9ac8-c7dc2ff4aeff" xlink:to="loc_us-gaap_PatentsMember_019dfe77-3bc1-7df4-a7d6-0040eb6feb02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_TradeNamesAndTrademarksMember_019dfe77-3bc1-749d-b5f4-827b24f1ec85" xlink:href="revv-20260405.xsd#revv_TradeNamesAndTrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-77bb-9ac8-c7dc2ff4aeff" xlink:to="loc_revv_TradeNamesAndTrademarksMember_019dfe77-3bc1-749d-b5f4-827b24f1ec85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_019dfe77-3bc1-7c19-9cef-8fdbfd357776" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-77bb-9ac8-c7dc2ff4aeff" xlink:to="loc_us-gaap_LicensingAgreementsMember_019dfe77-3bc1-7c19-9cef-8fdbfd357776" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CoreTechnologyMember_019dfe77-3bc1-7fc7-8305-acda570a167c" xlink:href="revv-20260405.xsd#revv_CoreTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-77bb-9ac8-c7dc2ff4aeff" xlink:to="loc_revv_CoreTechnologyMember_019dfe77-3bc1-7fc7-8305-acda570a167c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019dfe77-3bc1-7a5f-99d7-966357418c51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-77bb-9ac8-c7dc2ff4aeff" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019dfe77-3bc1-7a5f-99d7-966357418c51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InProcessResearchAndDevelopmentMember_019dfe77-3bc1-78ce-8e78-71ebb5e3ac2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InProcessResearchAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsMajorClassNameDomain_019dfe77-3bc1-77bb-9ac8-c7dc2ff4aeff" xlink:to="loc_us-gaap_InProcessResearchAndDevelopmentMember_019dfe77-3bc1-78ce-8e78-71ebb5e3ac2d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019dfe77-3bc1-796f-ae76-d7bbe0488023" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_019dfe77-3bc1-7e33-aee8-0da733f0baad" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019dfe77-3bc1-796f-ae76-d7bbe0488023" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019dfe77-3bc1-7491-84f6-9923a7172835" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_019dfe77-3bc1-7e33-aee8-0da733f0baad" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019dfe77-3bc1-7491-84f6-9923a7172835" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019dfe77-3bc1-71ac-b181-25b6cf44b3b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_019dfe77-3bc1-7e33-aee8-0da733f0baad" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019dfe77-3bc1-71ac-b181-25b6cf44b3b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019dfe77-3bc1-7be7-9c2a-c9955218f489" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_019dfe77-3bc1-7e33-aee8-0da733f0baad" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019dfe77-3bc1-7be7-9c2a-c9955218f489" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019dfe77-3bc1-7aee-b013-e9ae209eaac7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_FiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems_019dfe77-3bc1-7e33-aee8-0da733f0baad" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019dfe77-3bc1-7aee-b013-e9ae209eaac7" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/DerivativesAndHedgingActivitiesDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#DerivativesAndHedgingActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/DerivativesAndHedgingActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019dfe77-3bc1-7a4f-be8e-86f69a6c626e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_srt_CurrencyAxis_019dfe77-3bc1-7a4f-be8e-86f69a6c626e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-7a4f-be8e-86f69a6c626e_default" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019dfe77-3bc1-7a4f-be8e-86f69a6c626e" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-7a4f-be8e-86f69a6c626e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-703b-bf37-ec9da4ad7910" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019dfe77-3bc1-7a4f-be8e-86f69a6c626e" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-703b-bf37-ec9da4ad7910" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_EUR_019dfe77-3bc1-73c0-b140-60595304c8d1" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_EUR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-703b-bf37-ec9da4ad7910" xlink:to="loc_currency_EUR_019dfe77-3bc1-73c0-b140-60595304c8d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-7585-af55-e4e5e02dbcd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-7585-af55-e4e5e02dbcd1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7585-af55-e4e5e02dbcd1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-7585-af55-e4e5e02dbcd1" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7585-af55-e4e5e02dbcd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7d3b-8f1d-091235a6d934" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-7585-af55-e4e5e02dbcd1" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7d3b-8f1d-091235a6d934" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dfe77-3bc1-716c-8ef9-5bb66992ab2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7d3b-8f1d-091235a6d934" xlink:to="loc_us-gaap_SubsequentEventMember_019dfe77-3bc1-716c-8ef9-5bb66992ab2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NetinvestmenthedgeAxis_019dfe77-3bc1-72d9-919e-4b80794eb9f1" xlink:href="revv-20260405.xsd#revv_NetinvestmenthedgeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_revv_NetinvestmenthedgeAxis_019dfe77-3bc1-72d9-919e-4b80794eb9f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NetinvestmenthedgeDomain_019dfe77-3bc1-72d9-919e-4b80794eb9f1_default" xlink:href="revv-20260405.xsd#revv_NetinvestmenthedgeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_NetinvestmenthedgeAxis_019dfe77-3bc1-72d9-919e-4b80794eb9f1" xlink:to="loc_revv_NetinvestmenthedgeDomain_019dfe77-3bc1-72d9-919e-4b80794eb9f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NetinvestmenthedgeDomain_019dfe77-3bc1-7456-b1f8-6f6e7fc12a7a" xlink:href="revv-20260405.xsd#revv_NetinvestmenthedgeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_NetinvestmenthedgeAxis_019dfe77-3bc1-72d9-919e-4b80794eb9f1" xlink:to="loc_revv_NetinvestmenthedgeDomain_019dfe77-3bc1-7456-b1f8-6f6e7fc12a7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019dfe77-3bc1-7ebd-800f-e9d044a841db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_NetinvestmenthedgeDomain_019dfe77-3bc1-7456-b1f8-6f6e7fc12a7a" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019dfe77-3bc1-7ebd-800f-e9d044a841db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DerivativeNotionalCurrencyAxis_019dfe77-3bc1-756b-9f61-f6526efdd042" xlink:href="revv-20260405.xsd#revv_DerivativeNotionalCurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_revv_DerivativeNotionalCurrencyAxis_019dfe77-3bc1-756b-9f61-f6526efdd042" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DerivativeNotionalCurrencyDomain_019dfe77-3bc1-756b-9f61-f6526efdd042_default" xlink:href="revv-20260405.xsd#revv_DerivativeNotionalCurrencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_DerivativeNotionalCurrencyAxis_019dfe77-3bc1-756b-9f61-f6526efdd042" xlink:to="loc_revv_DerivativeNotionalCurrencyDomain_019dfe77-3bc1-756b-9f61-f6526efdd042_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DerivativeNotionalCurrencyDomain_019dfe77-3bc1-75d8-b8b2-4e97e4276c48" xlink:href="revv-20260405.xsd#revv_DerivativeNotionalCurrencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_DerivativeNotionalCurrencyAxis_019dfe77-3bc1-756b-9f61-f6526efdd042" xlink:to="loc_revv_DerivativeNotionalCurrencyDomain_019dfe77-3bc1-75d8-b8b2-4e97e4276c48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NotionalAmountofEuroDerivativesMember_019dfe77-3bc1-773e-9e9c-c273f77c32ea" xlink:href="revv-20260405.xsd#revv_NotionalAmountofEuroDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_DerivativeNotionalCurrencyDomain_019dfe77-3bc1-75d8-b8b2-4e97e4276c48" xlink:to="loc_revv_NotionalAmountofEuroDerivativesMember_019dfe77-3bc1-773e-9e9c-c273f77c32ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NotionalAmountofSEKDerivativesMember_019dfe77-3bc1-79c0-b30a-8ffb77d87b9b" xlink:href="revv-20260405.xsd#revv_NotionalAmountofSEKDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_DerivativeNotionalCurrencyDomain_019dfe77-3bc1-75d8-b8b2-4e97e4276c48" xlink:to="loc_revv_NotionalAmountofSEKDerivativesMember_019dfe77-3bc1-79c0-b30a-8ffb77d87b9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_NotionalAmountofUSDollarDerivativesMember_019dfe77-3bc1-71f3-8a07-a67e034bacb5" xlink:href="revv-20260405.xsd#revv_NotionalAmountofUSDollarDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_DerivativeNotionalCurrencyDomain_019dfe77-3bc1-75d8-b8b2-4e97e4276c48" xlink:to="loc_revv_NotionalAmountofUSDollarDerivativesMember_019dfe77-3bc1-71f3-8a07-a67e034bacb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-79fa-b87f-e8b4df941107" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-79fa-b87f-e8b4df941107" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-79fa-b87f-e8b4df941107_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-79fa-b87f-e8b4df941107" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-79fa-b87f-e8b4df941107_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7021-a604-946263d981de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-79fa-b87f-e8b4df941107" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7021-a604-946263d981de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019dfe77-3bc1-730a-971f-0962379d098d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7021-a604-946263d981de" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019dfe77-3bc1-730a-971f-0962379d098d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019dfe77-3bc1-7599-bee4-822ad7074615" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7021-a604-946263d981de" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019dfe77-3bc1-7599-bee4-822ad7074615" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019dfe77-3bc1-7208-8df3-03efa46d7568" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7021-a604-946263d981de" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019dfe77-3bc1-7208-8df3-03efa46d7568" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019dfe77-3bc1-7f41-9af4-03f431525ab2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019dfe77-3bc1-7f41-9af4-03f431525ab2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019dfe77-3bc1-7f41-9af4-03f431525ab2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019dfe77-3bc1-7f41-9af4-03f431525ab2" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019dfe77-3bc1-7f41-9af4-03f431525ab2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019dfe77-3bc1-702e-8de5-e4802c442691" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019dfe77-3bc1-7f41-9af4-03f431525ab2" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019dfe77-3bc1-702e-8de5-e4802c442691" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019dfe77-3bc1-725a-a122-cc149124f9bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019dfe77-3bc1-702e-8de5-e4802c442691" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019dfe77-3bc1-725a-a122-cc149124f9bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7237-a682-f71b54a324be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7237-a682-f71b54a324be" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7237-a682-f71b54a324be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7237-a682-f71b54a324be" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7237-a682-f71b54a324be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-745b-9183-796b0aa6f8b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7237-a682-f71b54a324be" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-745b-9183-796b0aa6f8b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019dfe77-3bc1-7b42-b60c-7172ddeeb935" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019dfe77-3bc1-7b42-b60c-7172ddeeb935" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019dfe77-3bc1-7b42-b60c-7172ddeeb935_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019dfe77-3bc1-7b42-b60c-7172ddeeb935" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019dfe77-3bc1-7b42-b60c-7172ddeeb935_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019dfe77-3bc1-72c4-b597-912a0354f23f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019dfe77-3bc1-7b42-b60c-7172ddeeb935" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019dfe77-3bc1-72c4-b597-912a0354f23f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019dfe77-3bc1-78ad-86ac-3f1a67cd8ffe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019dfe77-3bc1-72c4-b597-912a0354f23f" xlink:to="loc_us-gaap_CashFlowHedgingMember_019dfe77-3bc1-78ad-86ac-3f1a67cd8ffe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019dfe77-3bc1-7a5f-ad66-e862ec1f1a65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019dfe77-3bc1-72c4-b597-912a0354f23f" xlink:to="loc_us-gaap_FairValueHedgingMember_019dfe77-3bc1-7a5f-ad66-e862ec1f1a65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RemovalOfHedgingRelationshipAxis_019dfe77-3bc1-74a7-a2f2-3fadf3c34bea" xlink:href="revv-20260405.xsd#revv_RemovalOfHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_revv_RemovalOfHedgingRelationshipAxis_019dfe77-3bc1-74a7-a2f2-3fadf3c34bea" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RemovalOfHedgingRelationshipDomain_019dfe77-3bc1-74a7-a2f2-3fadf3c34bea_default" xlink:href="revv-20260405.xsd#revv_RemovalOfHedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_RemovalOfHedgingRelationshipAxis_019dfe77-3bc1-74a7-a2f2-3fadf3c34bea" xlink:to="loc_revv_RemovalOfHedgingRelationshipDomain_019dfe77-3bc1-74a7-a2f2-3fadf3c34bea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_RemovalOfHedgingRelationshipDomain_019dfe77-3bc1-78ab-be1d-973e786a11f5" xlink:href="revv-20260405.xsd#revv_RemovalOfHedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_RemovalOfHedgingRelationshipAxis_019dfe77-3bc1-74a7-a2f2-3fadf3c34bea" xlink:to="loc_revv_RemovalOfHedgingRelationshipDomain_019dfe77-3bc1-78ab-be1d-973e786a11f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis_019dfe77-3bc1-7c46-9f0d-53768efb6001" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis_019dfe77-3bc1-7c46-9f0d-53768efb6001" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntercompanyForeignCurrencyBalanceNameDomain_019dfe77-3bc1-7c46-9f0d-53768efb6001_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntercompanyForeignCurrencyBalanceNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis_019dfe77-3bc1-7c46-9f0d-53768efb6001" xlink:to="loc_us-gaap_IntercompanyForeignCurrencyBalanceNameDomain_019dfe77-3bc1-7c46-9f0d-53768efb6001_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntercompanyForeignCurrencyBalanceNameDomain_019dfe77-3bc1-7b81-bd5e-da253e309e46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntercompanyForeignCurrencyBalanceNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis_019dfe77-3bc1-7c46-9f0d-53768efb6001" xlink:to="loc_us-gaap_IntercompanyForeignCurrencyBalanceNameDomain_019dfe77-3bc1-7b81-bd5e-da253e309e46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_EuropeanAndAsianCurrenciesMember_019dfe77-3bc1-7ba8-8352-22a7f821eaa1" xlink:href="revv-20260405.xsd#revv_EuropeanAndAsianCurrenciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntercompanyForeignCurrencyBalanceNameDomain_019dfe77-3bc1-7b81-bd5e-da253e309e46" xlink:to="loc_revv_EuropeanAndAsianCurrenciesMember_019dfe77-3bc1-7ba8-8352-22a7f821eaa1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-7436-bb4a-a528b97a99ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-7436-bb4a-a528b97a99ff" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7436-bb4a-a528b97a99ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-7436-bb4a-a528b97a99ff" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7436-bb4a-a528b97a99ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7bfc-ab3b-8e27435ed9eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-7436-bb4a-a528b97a99ff" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7bfc-ab3b-8e27435ed9eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A1.875PercentTenYearSeniorUnsecuredNotesMember_019dfe77-3bc1-78cd-9e4f-daf518482c28" xlink:href="revv-20260405.xsd#revv_A1.875PercentTenYearSeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7bfc-ab3b-8e27435ed9eb" xlink:to="loc_revv_A1.875PercentTenYearSeniorUnsecuredNotesMember_019dfe77-3bc1-78cd-9e4f-daf518482c28" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_InterestRateSwaptionAxis_019dfe77-3bc1-7192-a217-3908fb2bcac4" xlink:href="revv-20260405.xsd#revv_InterestRateSwaptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019dfe77-3bc1-7b13-baec-279f41880deb" xlink:to="loc_revv_InterestRateSwaptionAxis_019dfe77-3bc1-7192-a217-3908fb2bcac4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_InterestRateSwaptionDomain_019dfe77-3bc1-7192-a217-3908fb2bcac4_default" xlink:href="revv-20260405.xsd#revv_InterestRateSwaptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_revv_InterestRateSwaptionAxis_019dfe77-3bc1-7192-a217-3908fb2bcac4" xlink:to="loc_revv_InterestRateSwaptionDomain_019dfe77-3bc1-7192-a217-3908fb2bcac4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_InterestRateSwaptionDomain_019dfe77-3bc1-7f79-84fd-b7a88d897d97" xlink:href="revv-20260405.xsd#revv_InterestRateSwaptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_revv_InterestRateSwaptionAxis_019dfe77-3bc1-7192-a217-3908fb2bcac4" xlink:to="loc_revv_InterestRateSwaptionDomain_019dfe77-3bc1-7f79-84fd-b7a88d897d97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwaptionMember_019dfe77-3bc1-75af-bd88-45c70990eac6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwaptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_revv_InterestRateSwaptionDomain_019dfe77-3bc1-7f79-84fd-b7a88d897d97" xlink:to="loc_us-gaap_InterestRateSwaptionMember_019dfe77-3bc1-75af-bd88-45c70990eac6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PercentageOfBusinessOutsideDomesticCountry_019dfe77-3bc1-7f50-b914-d9542d9231aa" xlink:href="revv-20260405.xsd#revv_PercentageOfBusinessOutsideDomesticCountry"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_revv_PercentageOfBusinessOutsideDomesticCountry_019dfe77-3bc1-7f50-b914-d9542d9231aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaximumRemainingMaturityOfForeignCurrencyDerivatives1_019dfe77-3bc1-726b-a270-08a17ca53852" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MaximumRemainingMaturityOfForeignCurrencyDerivatives1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_MaximumRemainingMaturityOfForeignCurrencyDerivatives1_019dfe77-3bc1-726b-a270-08a17ca53852" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseGrossOfTax_019dfe77-3bc1-7f8f-94fa-3501ef482c09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseGrossOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseGrossOfTax_019dfe77-3bc1-7f8f-94fa-3501ef482c09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DurationOfForeignCurrencyDerivatives_019dfe77-3bc1-77dd-9fe1-d7c6aa1bee12" xlink:href="revv-20260405.xsd#revv_DurationOfForeignCurrencyDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_revv_DurationOfForeignCurrencyDerivatives_019dfe77-3bc1-77dd-9fe1-d7c6aa1bee12" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_019dfe77-3bc1-7965-b518-a5d02ff49e46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForProceedsFromHedgeFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_019dfe77-3bc1-7965-b518-a5d02ff49e46" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotionalAmountOfNonderivativeInstruments_019dfe77-3bc1-7542-8a56-73f77d1ceb2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotionalAmountOfNonderivativeInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_NotionalAmountOfNonderivativeInstruments_019dfe77-3bc1-7542-8a56-73f77d1ceb2a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_019dfe77-3bc1-79cb-a44b-9973830893c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_019dfe77-3bc1-79cb-a44b-9973830893c6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_UnrealizedGainLossonNetInvestmentHedgeinAOCI_019dfe77-3bc1-7b7b-beb0-914d9bb41d88" xlink:href="revv-20260405.xsd#revv_UnrealizedGainLossonNetInvestmentHedgeinAOCI"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_revv_UnrealizedGainLossonNetInvestmentHedgeinAOCI_019dfe77-3bc1-7b7b-beb0-914d9bb41d88" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax_019dfe77-3bc1-7f7a-8d80-5a265712dff1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax_019dfe77-3bc1-7f7a-8d80-5a265712dff1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019dfe77-3bc1-74eb-a0c0-713a28252d0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019dfe77-3bc1-74eb-a0c0-713a28252d0e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_019dfe77-3bc1-7234-afaf-4df29355d73c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_019dfe77-3bc1-7234-afaf-4df29355d73c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019dfe77-3bc1-7772-b730-58ddd1b302bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019dfe77-3bc1-7dde-8655-f86f73295673" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019dfe77-3bc1-7772-b730-58ddd1b302bf" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7f04-bdae-54ea1296d195" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7f04-bdae-54ea1296d195" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7f04-bdae-54ea1296d195_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7f04-bdae-54ea1296d195" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7f04-bdae-54ea1296d195_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e8b-a7f7-c1226941d3cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7f04-bdae-54ea1296d195" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e8b-a7f7-c1226941d3cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019dfe77-3bc1-7b72-9f05-345f8be8d131" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e8b-a7f7-c1226941d3cf" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019dfe77-3bc1-7b72-9f05-345f8be8d131" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019dfe77-3bc1-7c05-bc02-f890c8fe48d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e8b-a7f7-c1226941d3cf" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019dfe77-3bc1-7c05-bc02-f890c8fe48d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019dfe77-3bc1-72f9-b31e-c6ea38ba4940" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7e8b-a7f7-c1226941d3cf" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019dfe77-3bc1-72f9-b31e-c6ea38ba4940" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019dfe77-3bc1-726d-bd9d-1b7c63dfb6be" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:to="loc_srt_RangeAxis_019dfe77-3bc1-726d-bd9d-1b7c63dfb6be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3bc1-726d-bd9d-1b7c63dfb6be_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019dfe77-3bc1-726d-bd9d-1b7c63dfb6be" xlink:to="loc_srt_RangeMember_019dfe77-3bc1-726d-bd9d-1b7c63dfb6be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfe77-3bc1-7a71-be12-e3787d392425" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019dfe77-3bc1-726d-bd9d-1b7c63dfb6be" xlink:to="loc_srt_RangeMember_019dfe77-3bc1-7a71-be12-e3787d392425" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019dfe77-3bc1-76fc-9fb2-be3d4a329d98" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfe77-3bc1-7a71-be12-e3787d392425" xlink:to="loc_srt_MinimumMember_019dfe77-3bc1-76fc-9fb2-be3d4a329d98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019dfe77-3bc1-7afb-a631-ecaf4d1c6376" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfe77-3bc1-7a71-be12-e3787d392425" xlink:to="loc_srt_MaximumMember_019dfe77-3bc1-7afb-a631-ecaf4d1c6376" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7b7b-95dd-d1d72c8f3d43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7b7b-95dd-d1d72c8f3d43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7b7b-95dd-d1d72c8f3d43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7b7b-95dd-d1d72c8f3d43" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7b7b-95dd-d1d72c8f3d43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7202-8cb8-e2da31861349" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dfe77-3bc1-7b7b-95dd-d1d72c8f3d43" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dfe77-3bc1-7202-8cb8-e2da31861349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-7d97-849c-1b398206c93b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:to="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-7d97-849c-1b398206c93b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7d97-849c-1b398206c93b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-7d97-849c-1b398206c93b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7d97-849c-1b398206c93b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019dfe77-3bc1-7d97-849c-1b398206c93b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A255PercentSeniorUnsecuredNotesDueIn2031Member_019dfe77-3bc1-781a-9f01-7fd5cdfea452" xlink:href="revv-20260405.xsd#revv_A255PercentSeniorUnsecuredNotesDueIn2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_A255PercentSeniorUnsecuredNotesDueIn2031Member_019dfe77-3bc1-781a-9f01-7fd5cdfea452" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A3625PercentSeniorUnsecuredNotesDueIn2051Member_019dfe77-3bc1-7bde-89fb-2189f5446343" xlink:href="revv-20260405.xsd#revv_A3625PercentSeniorUnsecuredNotesDueIn2051Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_A3625PercentSeniorUnsecuredNotesDueIn2051Member_019dfe77-3bc1-7bde-89fb-2189f5446343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_LineofCreditMaturingSeptember172024Member_019dfe77-3bc1-7cbc-aaf0-7c96a9f0ac0b" xlink:href="revv-20260405.xsd#revv_LineofCreditMaturingSeptember172024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_LineofCreditMaturingSeptember172024Member_019dfe77-3bc1-7cbc-aaf0-7c96a9f0ac0b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A1.875PercentTenYearSeniorUnsecuredNotesMember_019dfe77-3bc1-78b3-91b8-c91880ccba0e" xlink:href="revv-20260405.xsd#revv_A1.875PercentTenYearSeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_A1.875PercentTenYearSeniorUnsecuredNotesMember_019dfe77-3bc1-78b3-91b8-c91880ccba0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_A3.3PercentTenYearSeniorUnsecuredNotesdueinSept2029Member_019dfe77-3bc1-72d5-a0cb-bdaf306b1cad" xlink:href="revv-20260405.xsd#revv_A3.3PercentTenYearSeniorUnsecuredNotesdueinSept2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_A3.3PercentTenYearSeniorUnsecuredNotesdueinSept2029Member_019dfe77-3bc1-72d5-a0cb-bdaf306b1cad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_SeniorUnsecuredNotesMember_019dfe77-3bc1-7911-a848-2b1208a3872b" xlink:href="revv-20260405.xsd#revv_SeniorUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_SeniorUnsecuredNotesMember_019dfe77-3bc1-7911-a848-2b1208a3872b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherDebtFacilitiesIncludingTheSeniorRevolvingCreditFacilityMember_019dfe77-3bc1-78ec-835e-29df08ced562" xlink:href="revv-20260405.xsd#revv_OtherDebtFacilitiesIncludingTheSeniorRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_OtherDebtFacilitiesIncludingTheSeniorRevolvingCreditFacilityMember_019dfe77-3bc1-78ec-835e-29df08ced562" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherDebtFacilitiesExcludingTheSeniorRevolvingCreditFacilityMember_019dfe77-3bc1-708c-abef-efb2aaac8aa4" xlink:href="revv-20260405.xsd#revv_OtherDebtFacilitiesExcludingTheSeniorRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_OtherDebtFacilitiesExcludingTheSeniorRevolvingCreditFacilityMember_019dfe77-3bc1-708c-abef-efb2aaac8aa4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_OtherDebtFacilitiesMember_019dfe77-3bc1-7f38-8cad-9c96c5ccb782" xlink:href="revv-20260405.xsd#revv_OtherDebtFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019dfe77-3bc1-7066-a4c0-9fe41d6ee49f" xlink:to="loc_revv_OtherDebtFacilitiesMember_019dfe77-3bc1-7f38-8cad-9c96c5ccb782" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019dfe77-3bc1-78cf-8769-227c6f43a75a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:to="loc_srt_CurrencyAxis_019dfe77-3bc1-78cf-8769-227c6f43a75a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-78cf-8769-227c6f43a75a_default" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019dfe77-3bc1-78cf-8769-227c6f43a75a" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-78cf-8769-227c6f43a75a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-77c5-877e-dee7d00ddd84" xlink:href="https://xbrl.sec.gov/currency/2026/currency-2026.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019dfe77-3bc1-78cf-8769-227c6f43a75a" xlink:to="loc_currency_AllCurrenciesDomain_019dfe77-3bc1-77c5-877e-dee7d00ddd84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7a40-acf0-5d91a3b12810" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7a40-acf0-5d91a3b12810" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7a40-acf0-5d91a3b12810_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7a40-acf0-5d91a3b12810" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7a40-acf0-5d91a3b12810_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7a91-8c43-49bbd98391ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7a40-acf0-5d91a3b12810" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7a91-8c43-49bbd98391ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019dfe77-3bc1-79f8-9df6-1414f8437069" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7a91-8c43-49bbd98391ab" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019dfe77-3bc1-79f8-9df6-1414f8437069" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7233-8b0f-a860186c9c4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019dfe77-3bc1-7371-8805-0007b472d759" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7233-8b0f-a860186c9c4d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7233-8b0f-a860186c9c4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7233-8b0f-a860186c9c4d" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7233-8b0f-a860186c9c4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-70c2-8cbd-548d39b474f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7233-8b0f-a860186c9c4d" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-70c2-8cbd-548d39b474f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember_019dfe77-3bc1-704d-bbf1-ea987e252bb5" xlink:href="revv-20260405.xsd#revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-70c2-8cbd-548d39b474f4" xlink:to="loc_revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember_019dfe77-3bc1-704d-bbf1-ea987e252bb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtPercentageBearingFixedInterestAmount_019dfe77-3bc1-75db-8b28-207102efb329" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtPercentageBearingFixedInterestAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_LongtermDebtPercentageBearingFixedInterestAmount_019dfe77-3bc1-75db-8b28-207102efb329" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019dfe77-3bc1-7c3d-82a5-c5cff184c82f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019dfe77-3bc1-7c3d-82a5-c5cff184c82f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_Projectedmilestonedate_019dfe77-3bc1-7465-a4e4-db32c8412aa6" xlink:href="revv-20260405.xsd#revv_Projectedmilestonedate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_Projectedmilestonedate_019dfe77-3bc1-7465-a4e4-db32c8412aa6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue_019dfe77-3bc1-7ca7-9d3b-7e0fc15c180e" xlink:href="revv-20260405.xsd#revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurredContingentConsiderationAtFairValue_019dfe77-3bc1-7ca7-9d3b-7e0fc15c180e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_019dfe77-3bc1-7cef-b2ce-e557e15bf6cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_019dfe77-3bc1-7cef-b2ce-e557e15bf6cc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019dfe77-3bc1-732e-8d9c-c95a6c649ba8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019dfe77-3bc1-732e-8d9c-c95a6c649ba8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription_019dfe77-3bc1-7825-87e3-460547d1069c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription_019dfe77-3bc1-7825-87e3-460547d1069c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationContingentConsiderationArrangementsMaximumPeriod_019dfe77-3bc1-70b3-915b-439d9727b4eb" xlink:href="revv-20260405.xsd#revv_BusinessCombinationContingentConsiderationArrangementsMaximumPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_BusinessCombinationContingentConsiderationArrangementsMaximumPeriod_019dfe77-3bc1-70b3-915b-439d9727b4eb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationContingentConsiderationArrangementsWeightedAveragePeriod_019dfe77-3bc1-790c-9e2b-a77a8603e7bd" xlink:href="revv-20260405.xsd#revv_BusinessCombinationContingentConsiderationArrangementsWeightedAveragePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_BusinessCombinationContingentConsiderationArrangementsWeightedAveragePeriod_019dfe77-3bc1-790c-9e2b-a77a8603e7bd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019dfe77-3bc1-70f8-98ce-0a1dfef1ae00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019dfe77-3bc1-70f8-98ce-0a1dfef1ae00" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019dfe77-3bc1-7164-9b67-301f5ee682b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_LineOfCredit_019dfe77-3bc1-7164-9b67-301f5ee682b3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_019dfe77-3bc1-73b6-823c-1e94cfbaba00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_019dfe77-3bc1-73b6-823c-1e94cfbaba00" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019dfe77-3bc1-7d64-9d89-61f537a103e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019dfe77-3bc1-7d64-9d89-61f537a103e8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019dfe77-3bc1-7b54-9cac-4c31e31a1d11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_LongTermDebt_019dfe77-3bc1-7b54-9cac-4c31e31a1d11" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_019dfe77-3bc1-73cb-80c8-244032912a7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_019dfe77-3bc1-73cb-80c8-244032912a7d" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019dfe77-3bc1-74a3-a8f1-c1a5ffc4a684" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019dfe77-3bc1-74a3-a8f1-c1a5ffc4a684" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_019dfe77-3bc1-7e45-ba1d-d823c2fd3565" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_OtherLongTermDebt_019dfe77-3bc1-7e45-ba1d-d823c2fd3565" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_Conditionalprobabilityofsuccess_019dfe77-3bc1-74e6-9aaa-5b0bd40f83a0" xlink:href="revv-20260405.xsd#revv_Conditionalprobabilityofsuccess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_Conditionalprobabilityofsuccess_019dfe77-3bc1-74e6-9aaa-5b0bd40f83a0" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_Cumulativeprobabilityofsuccess_019dfe77-3bc1-70ff-afde-b76a52f53a8a" xlink:href="revv-20260405.xsd#revv_Cumulativeprobabilityofsuccess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_Cumulativeprobabilityofsuccess_019dfe77-3bc1-70ff-afde-b76a52f53a8a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityOperatingActivities_019dfe77-3bc1-779d-b6f7-89eee4f3928d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentForContingentConsiderationLiabilityOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityOperatingActivities_019dfe77-3bc1-779d-b6f7-89eee4f3928d" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019dfe77-3bc1-72ef-a3ed-f214c580f31b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019dfe77-3bc1-72ef-a3ed-f214c580f31b" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_BusinessCombinationContingentConsiderationMilestoneAchievedButNotPaidOtherCurrentLiability_019dfe77-3bc1-72d3-975b-ae9b341640c5" xlink:href="revv-20260405.xsd#revv_BusinessCombinationContingentConsiderationMilestoneAchievedButNotPaidOtherCurrentLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_BusinessCombinationContingentConsiderationMilestoneAchievedButNotPaidOtherCurrentLiability_019dfe77-3bc1-72d3-975b-ae9b341640c5" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DisposalGroupConsiderationContingentOnExitValuation_019dfe77-3bc1-7d7c-b65c-93424e50806e" xlink:href="revv-20260405.xsd#revv_DisposalGroupConsiderationContingentOnExitValuation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_DisposalGroupConsiderationContingentOnExitValuation_019dfe77-3bc1-7d7c-b65c-93424e50806e" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_CarryingValueOfInvestmentsInUSTreasurySecuritiesMeasuredAtAmortizedCostHeldToMaturity_019dfe77-3bc1-72e0-b9ca-547c8c7d3bc0" xlink:href="revv-20260405.xsd#revv_CarryingValueOfInvestmentsInUSTreasurySecuritiesMeasuredAtAmortizedCostHeldToMaturity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_revv_CarryingValueOfInvestmentsInUSTreasurySecuritiesMeasuredAtAmortizedCostHeldToMaturity_019dfe77-3bc1-72e0-b9ca-547c8c7d3bc0" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019dfe77-3bc1-7695-aa21-315d3a754c15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019dfe77-3bc1-7a88-99c7-bbaaa4f040c3" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019dfe77-3bc1-7695-aa21-315d3a754c15" xlink:type="arc" order="24"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/FairValueMeasurementsAssetsandLiabilitiesCarriedatFairValueMeasuredonaRecurringBasisDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#FairValueMeasurementsAssetsandLiabilitiesCarriedatFairValueMeasuredonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/FairValueMeasurementsAssetsandLiabilitiesCarriedatFairValueMeasuredonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019dfe77-3bc1-7ee1-aba0-24796baaedde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019dfe77-3bc1-712d-9c4f-f4b68a0cf595" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019dfe77-3bc1-7ee1-aba0-24796baaedde" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019dfe77-3bc1-712d-9c4f-f4b68a0cf595" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7f1d-8048-62ca081639ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019dfe77-3bc1-712d-9c4f-f4b68a0cf595" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7f1d-8048-62ca081639ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7f1d-8048-62ca081639ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7f1d-8048-62ca081639ce" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7f1d-8048-62ca081639ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7493-be31-e00d63d97334" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019dfe77-3bc1-7f1d-8048-62ca081639ce" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7493-be31-e00d63d97334" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019dfe77-3bc1-754e-bd97-17b68ae45538" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019dfe77-3bc1-7493-be31-e00d63d97334" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019dfe77-3bc1-754e-bd97-17b68ae45538" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7bbb-8aae-9716c2ccf340" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019dfe77-3bc1-712d-9c4f-f4b68a0cf595" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7bbb-8aae-9716c2ccf340" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7bbb-8aae-9716c2ccf340_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7bbb-8aae-9716c2ccf340" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-7bbb-8aae-9716c2ccf340_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-70a8-99d1-759c5ceba974" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019dfe77-3bc1-7bbb-8aae-9716c2ccf340" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-70a8-99d1-759c5ceba974" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019dfe77-3bc1-794b-9218-96a508ac2fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-70a8-99d1-759c5ceba974" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019dfe77-3bc1-794b-9218-96a508ac2fd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019dfe77-3bc1-7cd8-a846-717f49b022bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-70a8-99d1-759c5ceba974" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019dfe77-3bc1-7cd8-a846-717f49b022bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019dfe77-3bc1-7b5c-bf89-7ebace93aa95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019dfe77-3bc1-70a8-99d1-759c5ceba974" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019dfe77-3bc1-7b5c-bf89-7ebace93aa95" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019dfe77-3bc1-766d-9feb-3a27f078727a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019dfe77-3bc1-712d-9c4f-f4b68a0cf595" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019dfe77-3bc1-766d-9feb-3a27f078727a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019dfe77-3bc1-766d-9feb-3a27f078727a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019dfe77-3bc1-766d-9feb-3a27f078727a" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019dfe77-3bc1-766d-9feb-3a27f078727a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019dfe77-3bc1-7cac-a292-2f5a7c5cf82b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019dfe77-3bc1-766d-9feb-3a27f078727a" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019dfe77-3bc1-7cac-a292-2f5a7c5cf82b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019dfe77-3bc1-77ba-90d4-ddf560e63a99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019dfe77-3bc1-7cac-a292-2f5a7c5cf82b" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019dfe77-3bc1-77ba-90d4-ddf560e63a99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019dfe77-3bc1-7eb3-abd9-6ef12cf47878" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019dfe77-3bc1-7cac-a292-2f5a7c5cf82b" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019dfe77-3bc1-7eb3-abd9-6ef12cf47878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019dfe77-3bc1-7594-8312-e8acbd9856e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019dfe77-3bc1-7ee1-aba0-24796baaedde" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019dfe77-3bc1-7594-8312-e8acbd9856e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_019dfe77-3bc1-7367-b700-c4c5009e1cd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019dfe77-3bc1-7ee1-aba0-24796baaedde" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_019dfe77-3bc1-7367-b700-c4c5009e1cd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_019dfe77-3bc1-72b8-90bf-f4c8bda58b33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019dfe77-3bc1-7ee1-aba0-24796baaedde" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_019dfe77-3bc1-72b8-90bf-f4c8bda58b33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019dfe77-3bc1-7dab-84bc-f792760f00c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019dfe77-3bc1-7ee1-aba0-24796baaedde" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019dfe77-3bc1-7dab-84bc-f792760f00c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019dfe77-3bc1-7ec5-9ded-30bc2a42de3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019dfe77-3bc1-7ee1-aba0-24796baaedde" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019dfe77-3bc1-7ec5-9ded-30bc2a42de3e" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.revvity.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="revv-20260405.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.revvity.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019dfe77-3bc1-76ae-a498-697482d0a9cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019dfe77-3bc1-7e76-93f3-c510ad4e91a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dfe77-3bc1-76ae-a498-697482d0a9cf" xlink:to="loc_us-gaap_SubsequentEventTable_019dfe77-3bc1-7e76-93f3-c510ad4e91a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7921-b90a-a66e89b16eab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019dfe77-3bc1-7e76-93f3-c510ad4e91a5" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7921-b90a-a66e89b16eab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7921-b90a-a66e89b16eab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7921-b90a-a66e89b16eab" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7921-b90a-a66e89b16eab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7044-b3c9-e1cb8b7a1874" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dfe77-3bc1-7921-b90a-a66e89b16eab" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7044-b3c9-e1cb8b7a1874" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember_019dfe77-3bc1-789a-b077-b315a20627ec" xlink:href="revv-20260405.xsd#revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dfe77-3bc1-7044-b3c9-e1cb8b7a1874" xlink:to="loc_revv_AnalyticalFoodAndEnterpriseServicesBusinessesMember_019dfe77-3bc1-789a-b077-b315a20627ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-76f8-a5ad-ffc60c7960f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019dfe77-3bc1-7e76-93f3-c510ad4e91a5" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-76f8-a5ad-ffc60c7960f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-76f8-a5ad-ffc60c7960f7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-76f8-a5ad-ffc60c7960f7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-76f8-a5ad-ffc60c7960f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7565-85da-4f2dd89771ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfe77-3bc1-76f8-a5ad-ffc60c7960f7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7565-85da-4f2dd89771ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dfe77-3bc1-7284-b573-8cdde97b24b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dfe77-3bc1-7565-85da-4f2dd89771ba" xlink:to="loc_us-gaap_SubsequentEventMember_019dfe77-3bc1-7284-b573-8cdde97b24b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019dfe77-3bc1-7083-9013-3891213eb1ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dfe77-3bc1-76ae-a498-697482d0a9cf" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019dfe77-3bc1-7083-9013-3891213eb1ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DisposalGroupConsiderationReceivableAtClosing_019dfe77-3bc1-70cf-91a3-395772727106" xlink:href="revv-20260405.xsd#revv_DisposalGroupConsiderationReceivableAtClosing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dfe77-3bc1-76ae-a498-697482d0a9cf" xlink:to="loc_revv_DisposalGroupConsiderationReceivableAtClosing_019dfe77-3bc1-70cf-91a3-395772727106" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_DisposalGroupConsiderationContingentOnExitValuation_019dfe77-3bc1-7714-a159-fe246b5e65b2" xlink:href="revv-20260405.xsd#revv_DisposalGroupConsiderationContingentOnExitValuation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dfe77-3bc1-76ae-a498-697482d0a9cf" xlink:to="loc_revv_DisposalGroupConsiderationContingentOnExitValuation_019dfe77-3bc1-7714-a159-fe246b5e65b2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_JoelS.GoldbergMember_019dfe77-38cd-7fce-9b2a-0e3a81755273" xlink:href="revv-20260405.xsd#revv_JoelS.GoldbergMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_revv_JoelS.GoldbergMember_019dfe77-38cd-7fce-9b2a-0e3a81755273" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_revv_PrahladSinghMember_019dfe77-38cd-79c7-bb4a-45ad7f932b61" xlink:href="revv-20260405.xsd#revv_PrahladSinghMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_revv_PrahladSinghMember_019dfe77-38cd-79c7-bb4a-45ad7f932b61" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
