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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019cd372-5ce6-76ab-b3a9-715dd99b8ec1,g:52820389-28b3-4941-ad79-a24ef5d2b0f6-->
<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.everus.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="simple" xlink:href="ecg-20260331.xsd#CondensedConsolidatedStatementsofEquity"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019cd372-5e3a-7e0c-9842-5be21b3d7b29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019cd372-5e3a-73c5-81b2-9a0d2ca29273" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019cd372-5e3a-7e0c-9842-5be21b3d7b29" xlink:to="loc_us-gaap_StatementTable_019cd372-5e3a-73c5-81b2-9a0d2ca29273" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cd372-5e3a-75ad-a4ca-d8fbec767cd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019cd372-5e3a-73c5-81b2-9a0d2ca29273" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cd372-5e3a-75ad-a4ca-d8fbec767cd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cd372-5e3a-75ad-a4ca-d8fbec767cd4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cd372-5e3a-75ad-a4ca-d8fbec767cd4" xlink:to="loc_us-gaap_EquityComponentDomain_019cd372-5e3a-75ad-a4ca-d8fbec767cd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cd372-5e3a-7a38-92cc-889b8419f696" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cd372-5e3a-75ad-a4ca-d8fbec767cd4" xlink:to="loc_us-gaap_EquityComponentDomain_019cd372-5e3a-7a38-92cc-889b8419f696" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cd372-5e3a-7ab4-bb3c-2a1d523763b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cd372-5e3a-7a38-92cc-889b8419f696" xlink:to="loc_us-gaap_CommonStockMember_019cd372-5e3a-7ab4-bb3c-2a1d523763b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019cd372-5e3a-7ce4-9883-6567b9eb0e34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cd372-5e3a-7a38-92cc-889b8419f696" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019cd372-5e3a-7ce4-9883-6567b9eb0e34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019cd372-5e3a-70d8-949c-e3e990cd0bba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cd372-5e3a-7a38-92cc-889b8419f696" xlink:to="loc_us-gaap_RetainedEarningsMember_019cd372-5e3a-70d8-949c-e3e990cd0bba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd372-5e3a-7316-a9af-9c734ace5b42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019cd372-5e3a-7e0c-9842-5be21b3d7b29" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd372-5e3a-7316-a9af-9c734ace5b42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cd372-5e3a-7019-9f73-6cc262796185" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd372-5e3a-7316-a9af-9c734ace5b42" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019cd372-5e3a-7019-9f73-6cc262796185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cd372-5e3a-75e9-851c-b67820dbdc89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd372-5e3a-7316-a9af-9c734ace5b42" xlink:to="loc_us-gaap_StockholdersEquity_019cd372-5e3a-75e9-851c-b67820dbdc89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019cd372-5e3a-7854-a917-f5f654c73aa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd372-5e3a-7316-a9af-9c734ace5b42" xlink:to="loc_us-gaap_NetIncomeLoss_019cd372-5e3a-7854-a917-f5f654c73aa5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019cd372-5e3a-7e8e-a3fb-45ef0c09c5a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd372-5e3a-7316-a9af-9c734ace5b42" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019cd372-5e3a-7e8e-a3fb-45ef0c09c5a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_APICShareBasedPaymentArrangementIncreaseForCostRecognitionNetOfCommonSharesIssuedAndTaxWithholdingFromGrantee_019df622-5434-7454-9e93-6cb29fbf5694" xlink:href="ecg-20260331.xsd#ecg_APICShareBasedPaymentArrangementIncreaseForCostRecognitionNetOfCommonSharesIssuedAndTaxWithholdingFromGrantee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cd372-5e3a-7316-a9af-9c734ace5b42" xlink:to="loc_ecg_APICShareBasedPaymentArrangementIncreaseForCostRecognitionNetOfCommonSharesIssuedAndTaxWithholdingFromGrantee_019df622-5434-7454-9e93-6cb29fbf5694" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cd372-5e3a-7b3a-8f2f-4188ce2b7ddb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cd372-5e3a-7e63-bdc8-2a7b44eee4ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7741-8873-ab83bcd1159e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfProductInformationTable_019cd372-5e3a-7dda-afcb-ae185dfb5d73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfProductInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7741-8873-ab83bcd1159e" xlink:to="loc_us-gaap_ScheduleOfProductInformationTable_019cd372-5e3a-7dda-afcb-ae185dfb5d73" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cd372-5e3a-73cd-8e55-8626e7cfc52f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfProductInformationTable_019cd372-5e3a-7dda-afcb-ae185dfb5d73" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cd372-5e3a-73cd-8e55-8626e7cfc52f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019cd372-5e3a-73cd-8e55-8626e7cfc52f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cd372-5e3a-73cd-8e55-8626e7cfc52f" xlink:to="loc_us-gaap_RelatedPartyDomain_019cd372-5e3a-73cd-8e55-8626e7cfc52f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019cd372-5e3a-7c9b-be78-6eb25cb78bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cd372-5e3a-73cd-8e55-8626e7cfc52f" xlink:to="loc_us-gaap_RelatedPartyDomain_019cd372-5e3a-7c9b-be78-6eb25cb78bb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateJointVentureMember_019cd372-5e3a-7fdc-b9f2-00d4a3692d07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019cd372-5e3a-7c9b-be78-6eb25cb78bb0" xlink:to="loc_us-gaap_CorporateJointVentureMember_019cd372-5e3a-7fdc-b9f2-00d4a3692d07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019cd372-5e3a-7b87-83d8-5e874f598bce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfProductInformationTable_019cd372-5e3a-7dda-afcb-ae185dfb5d73" xlink:to="loc_us-gaap_InvestmentTypeAxis_019cd372-5e3a-7b87-83d8-5e874f598bce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cd372-5e3a-7b87-83d8-5e874f598bce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cd372-5e3a-7b87-83d8-5e874f598bce" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cd372-5e3a-7b87-83d8-5e874f598bce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cd372-5e3a-76ca-b0af-8c5cdd7ea435" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cd372-5e3a-7b87-83d8-5e874f598bce" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cd372-5e3a-76ca-b0af-8c5cdd7ea435" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CentralCashManagementMember_019cd372-5e3a-7797-ad1b-279ce8235972" xlink:href="ecg-20260331.xsd#ecg_CentralCashManagementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cd372-5e3a-76ca-b0af-8c5cdd7ea435" xlink:to="loc_ecg_CentralCashManagementMember_019cd372-5e3a-7797-ad1b-279ce8235972" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CaptiveCellMember_019cd372-5e3a-7ee7-b717-e8f713b879b5" xlink:href="ecg-20260331.xsd#ecg_CaptiveCellMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cd372-5e3a-76ca-b0af-8c5cdd7ea435" xlink:to="loc_ecg_CaptiveCellMember_019cd372-5e3a-7ee7-b717-e8f713b879b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019cd372-5e3a-7abf-b717-fbc5a3ad0aa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7741-8873-ab83bcd1159e" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019cd372-5e3a-7abf-b717-fbc5a3ad0aa5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets_019cd372-5e3a-7cc3-ab97-b41e35156eae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7741-8873-ab83bcd1159e" xlink:to="loc_us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets_019cd372-5e3a-7cc3-ab97-b41e35156eae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019cd372-5e3a-7996-9705-a324ae80470c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7741-8873-ab83bcd1159e" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019cd372-5e3a-7996-9705-a324ae80470c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019cd372-5e3a-75ab-8b63-7d7c5eca1e7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7741-8873-ab83bcd1159e" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019cd372-5e3a-75ab-8b63-7d7c5eca1e7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNonoperating_019cd372-5e3a-7ec7-85e4-7e2c4c82551d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7741-8873-ab83bcd1159e" xlink:to="loc_us-gaap_InvestmentIncomeNonoperating_019cd372-5e3a-7ec7-85e4-7e2c4c82551d" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesVariableInterestEntityDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesVariableInterestEntityDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesVariableInterestEntityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019cd372-5e3a-7866-960a-6894a7e64c2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019cd372-5e3a-70f2-bd6b-c0a73defa1af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019cd372-5e3a-7866-960a-6894a7e64c2d" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019cd372-5e3a-70f2-bd6b-c0a73defa1af" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019cd372-5e3a-7b9f-ba70-ab3689c7df3a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019cd372-5e3a-70f2-bd6b-c0a73defa1af" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019cd372-5e3a-7b9f-ba70-ab3689c7df3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019cd372-5e3a-7b9f-ba70-ab3689c7df3a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019cd372-5e3a-7b9f-ba70-ab3689c7df3a" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019cd372-5e3a-7b9f-ba70-ab3689c7df3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019cd372-5e3a-7977-8d35-f3d19e2a9a98" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019cd372-5e3a-7b9f-ba70-ab3689c7df3a" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019cd372-5e3a-7977-8d35-f3d19e2a9a98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019cd372-5e3a-79b1-9e93-739a2c9f2571" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019cd372-5e3a-7977-8d35-f3d19e2a9a98" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019cd372-5e3a-79b1-9e93-739a2c9f2571" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019cd372-5e3a-7a23-afcd-90a6b3720d0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019cd372-5e3a-7866-960a-6894a7e64c2d" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019cd372-5e3a-7a23-afcd-90a6b3720d0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_019cd372-5e3a-7bed-9186-934a1de22ec5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019cd372-5e3a-7866-960a-6894a7e64c2d" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_019cd372-5e3a-7bed-9186-934a1de22ec5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019cd372-5e3a-734b-8f1c-4d87b7d5f27c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019cd372-5e3a-7866-960a-6894a7e64c2d" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019cd372-5e3a-734b-8f1c-4d87b7d5f27c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesSummaryofAccountsReceivableDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesSummaryofAccountsReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesSummaryofAccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7900-8cf1-cedc1641d3a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfProductInformationTable_019cd372-5e3a-7a44-a7c5-ec49bcd52036" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfProductInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7900-8cf1-cedc1641d3a4" xlink:to="loc_us-gaap_ScheduleOfProductInformationTable_019cd372-5e3a-7a44-a7c5-ec49bcd52036" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019cd372-5e3a-701d-b4e8-78d8f5b75ca7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfProductInformationTable_019cd372-5e3a-7a44-a7c5-ec49bcd52036" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019cd372-5e3a-701d-b4e8-78d8f5b75ca7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_019cd372-5e3a-701d-b4e8-78d8f5b75ca7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019cd372-5e3a-701d-b4e8-78d8f5b75ca7" xlink:to="loc_us-gaap_ReceivableTypeDomain_019cd372-5e3a-701d-b4e8-78d8f5b75ca7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_019cd372-5e3a-7100-bc13-38f50d690b59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019cd372-5e3a-701d-b4e8-78d8f5b75ca7" xlink:to="loc_us-gaap_ReceivableTypeDomain_019cd372-5e3a-7100-bc13-38f50d690b59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ReceivablesCompletedContractsMember_019cd372-5e3a-7935-893d-ceb6f33e9a5b" xlink:href="ecg-20260331.xsd#ecg_ReceivablesCompletedContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_019cd372-5e3a-7100-bc13-38f50d690b59" xlink:to="loc_ecg_ReceivablesCompletedContractsMember_019cd372-5e3a-7935-893d-ceb6f33e9a5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ReceivablesContractsInProgressMember_019cd372-5e3a-7671-99e2-8b83006a9df8" xlink:href="ecg-20260331.xsd#ecg_ReceivablesContractsInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_019cd372-5e3a-7100-bc13-38f50d690b59" xlink:to="loc_ecg_ReceivablesContractsInProgressMember_019cd372-5e3a-7671-99e2-8b83006a9df8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_019cd372-5e3a-7362-b808-9dbfe014cea7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7900-8cf1-cedc1641d3a4" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_019cd372-5e3a-7362-b808-9dbfe014cea7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesGrossCurrent_019cd372-5e3a-738a-9100-f9a6e350c0af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7900-8cf1-cedc1641d3a4" xlink:to="loc_us-gaap_OtherReceivablesGrossCurrent_019cd372-5e3a-738a-9100-f9a6e350c0af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ReceivablesGrossCurrent_019cd372-5e3a-79de-b585-ad6d17c36fc0" xlink:href="ecg-20260331.xsd#ecg_ReceivablesGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7900-8cf1-cedc1641d3a4" xlink:to="loc_ecg_ReceivablesGrossCurrent_019cd372-5e3a-79de-b585-ad6d17c36fc0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ReceivablesAllowanceForCreditLossCurrent_019cd372-5e3a-7775-8d5a-88af4ec54804" xlink:href="ecg-20260331.xsd#ecg_ReceivablesAllowanceForCreditLossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7900-8cf1-cedc1641d3a4" xlink:to="loc_ecg_ReceivablesAllowanceForCreditLossCurrent_019cd372-5e3a-7775-8d5a-88af4ec54804" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_019cd372-5e3a-7155-8ce1-ef5684338854" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductInformationLineItems_019cd372-5e3a-7900-8cf1-cedc1641d3a4" xlink:to="loc_us-gaap_ReceivablesNetCurrent_019cd372-5e3a-7155-8ce1-ef5684338854" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/RevenuefromContractswithCustomersScheduleoftheDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#RevenuefromContractswithCustomersScheduleoftheDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/RevenuefromContractswithCustomersScheduleoftheDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd372-5e3a-78c9-91e5-a67b8d37c186" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019cd372-5e3a-7671-a356-ed3ec39c5943" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd372-5e3a-78c9-91e5-a67b8d37c186" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cd372-5e3a-7671-a356-ed3ec39c5943" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-70da-8bda-7dfa0f2f359c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cd372-5e3a-7671-a356-ed3ec39c5943" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-70da-8bda-7dfa0f2f359c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5e3a-70da-8bda-7dfa0f2f359c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-70da-8bda-7dfa0f2f359c" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5e3a-70da-8bda-7dfa0f2f359c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5e3a-7c3f-99c8-9692615e7bbe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-70da-8bda-7dfa0f2f359c" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5e3a-7c3f-99c8-9692615e7bbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5e3a-7cfb-9876-ce28a63900ff" xlink:href="ecg-20260331.xsd#ecg_ElectricalAndMechanicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5e3a-7c3f-99c8-9692615e7bbe" xlink:to="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5e3a-7cfb-9876-ce28a63900ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5e3a-7e7d-a3b8-17250fa9dd34" xlink:href="ecg-20260331.xsd#ecg_TransmissionAndDistributionSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5e3a-7c3f-99c8-9692615e7bbe" xlink:to="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5e3a-7e7d-a3b8-17250fa9dd34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019cd372-5e3a-7493-9f06-82839f79bca1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cd372-5e3a-7671-a356-ed3ec39c5943" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019cd372-5e3a-7493-9f06-82839f79bca1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019cd372-5e3a-7493-9f06-82839f79bca1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019cd372-5e3a-7493-9f06-82839f79bca1" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019cd372-5e3a-7493-9f06-82839f79bca1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019cd372-5e3a-7b99-a50d-e5a92a5b8238" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_019cd372-5e3a-7493-9f06-82839f79bca1" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019cd372-5e3a-7b99-a50d-e5a92a5b8238" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedPriceContractMember_019cd372-5e3a-7ea3-93d6-904ead02289e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedPriceContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019cd372-5e3a-7b99-a50d-e5a92a5b8238" xlink:to="loc_us-gaap_FixedPriceContractMember_019cd372-5e3a-7ea3-93d6-904ead02289e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CostReimbursableContractMember_019cd372-5e3a-709e-8939-2069bcd2b40e" xlink:href="ecg-20260331.xsd#ecg_CostReimbursableContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019cd372-5e3a-7b99-a50d-e5a92a5b8238" xlink:to="loc_ecg_CostReimbursableContractMember_019cd372-5e3a-709e-8939-2069bcd2b40e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_UnitPriceContractMember_019cd372-5e3a-7b1a-a6b6-ad88c30eac3a" xlink:href="ecg-20260331.xsd#ecg_UnitPriceContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_019cd372-5e3a-7b99-a50d-e5a92a5b8238" xlink:to="loc_ecg_UnitPriceContractMember_019cd372-5e3a-7b1a-a6b6-ad88c30eac3a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019cd372-5e3a-7c26-b57d-2888a6e28218" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cd372-5e3a-7671-a356-ed3ec39c5943" xlink:to="loc_srt_MajorCustomersAxis_019cd372-5e3a-7c26-b57d-2888a6e28218" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-7c26-b57d-2888a6e28218_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019cd372-5e3a-7c26-b57d-2888a6e28218" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-7c26-b57d-2888a6e28218_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019cd372-5e3a-7c26-b57d-2888a6e28218" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CommercialMember_019cd372-5e3a-78a8-9905-61fcac569c1f" xlink:href="ecg-20260331.xsd#ecg_CommercialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:to="loc_ecg_CommercialMember_019cd372-5e3a-78a8-9905-61fcac569c1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_InstitutionalMember_019cd372-5e3a-7d5a-9a44-4ac7933df480" xlink:href="ecg-20260331.xsd#ecg_InstitutionalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:to="loc_ecg_InstitutionalMember_019cd372-5e3a-7d5a-9a44-4ac7933df480" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_IndustrialMember_019cd372-5e3a-7b0e-b138-2c37f5dba621" xlink:href="ecg-20260331.xsd#ecg_IndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:to="loc_ecg_IndustrialMember_019cd372-5e3a-7b0e-b138-2c37f5dba621" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ServiceAndOtherMember_019cd372-5e3a-7b13-acc3-09e71240ce29" xlink:href="ecg-20260331.xsd#ecg_ServiceAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:to="loc_ecg_ServiceAndOtherMember_019cd372-5e3a-7b13-acc3-09e71240ce29" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_RenewablesMember_019cd372-5e3a-74e4-a45e-259443ef1a57" xlink:href="ecg-20260331.xsd#ecg_RenewablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:to="loc_ecg_RenewablesMember_019cd372-5e3a-74e4-a45e-259443ef1a57" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_UtilityMember_019cd372-5e3a-7a85-8a70-a66f9b74646a" xlink:href="ecg-20260331.xsd#ecg_UtilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:to="loc_ecg_UtilityMember_019cd372-5e3a-7a85-8a70-a66f9b74646a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransportationMember_019cd372-5e3a-7d1b-904e-360e98d69839" xlink:href="ecg-20260331.xsd#ecg_TransportationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5e3a-79f6-9d9f-228620951e21" xlink:to="loc_ecg_TransportationMember_019cd372-5e3a-7d1b-904e-360e98d69839" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019cd372-5e3a-7374-b599-6e1f50b8fa9c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cd372-5e3a-7671-a356-ed3ec39c5943" xlink:to="loc_srt_ConsolidationItemsAxis_019cd372-5e3a-7374-b599-6e1f50b8fa9c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5e3a-7374-b599-6e1f50b8fa9c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5e3a-7374-b599-6e1f50b8fa9c" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5e3a-7374-b599-6e1f50b8fa9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5e3a-7613-a5bb-ec86eca72f3a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5e3a-7374-b599-6e1f50b8fa9c" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5e3a-7613-a5bb-ec86eca72f3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019cd372-5e3a-78ec-87a8-baa7bab47d32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5e3a-7613-a5bb-ec86eca72f3a" xlink:to="loc_us-gaap_OperatingSegmentsMember_019cd372-5e3a-78ec-87a8-baa7bab47d32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019cd372-5e3a-75e4-ad9e-2096bc8ce7be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5e3a-7613-a5bb-ec86eca72f3a" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019cd372-5e3a-75e4-ad9e-2096bc8ce7be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cd372-5e3a-72bf-9754-26a77c8fd8ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cd372-5e3a-78c9-91e5-a67b8d37c186" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cd372-5e3a-72bf-9754-26a77c8fd8ba" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/RevenuefromContractswithCustomersSummaryofRemainingPerformanceObligationsandExpectedRevenueRecognitionDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#RevenuefromContractswithCustomersSummaryofRemainingPerformanceObligationsandExpectedRevenueRecognitionDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/RevenuefromContractswithCustomersSummaryofRemainingPerformanceObligationsandExpectedRevenueRecognitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019cd372-5e3a-7d0f-8b54-09bffe0b8328" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019cd372-5e3a-7967-9154-25329bc04b21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019cd372-5e3a-7d0f-8b54-09bffe0b8328" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019cd372-5e3a-7967-9154-25329bc04b21" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019cd372-5e3a-7494-8b31-18c773bc72e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019cd372-5e3a-7967-9154-25329bc04b21" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019cd372-5e3a-7494-8b31-18c773bc72e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019cd372-5e3a-7967-9154-25329bc04b21" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5e3a-7be3-9b03-c136eadd002f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5e3a-7be3-9b03-c136eadd002f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5e3a-715c-a0a5-fe2c2e04107a" xlink:href="ecg-20260331.xsd#ecg_ElectricalAndMechanicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5e3a-7be3-9b03-c136eadd002f" xlink:to="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5e3a-715c-a0a5-fe2c2e04107a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5e3a-7f9f-a01d-a4b5d43ca748" xlink:href="ecg-20260331.xsd#ecg_TransmissionAndDistributionSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5e3a-7be3-9b03-c136eadd002f" xlink:to="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5e3a-7f9f-a01d-a4b5d43ca748" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019cd372-5e3a-715c-ac7a-ffab24e1d78a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019cd372-5e3a-7d0f-8b54-09bffe0b8328" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019cd372-5e3a-715c-ac7a-ffab24e1d78a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019cd372-5e3a-7139-acc4-0d12c8f52c9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019cd372-5e3a-7d0f-8b54-09bffe0b8328" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019cd372-5e3a-7139-acc4-0d12c8f52c9f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/RevenuefromContractswithCustomersSummaryofRemainingPerformanceObligationsandExpectedRevenueRecognitionDetails_1" xlink:type="simple" xlink:href="ecg-20260331.xsd#RevenuefromContractswithCustomersSummaryofRemainingPerformanceObligationsandExpectedRevenueRecognitionDetails_1"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/RevenuefromContractswithCustomersSummaryofRemainingPerformanceObligationsandExpectedRevenueRecognitionDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019cd372-5e3a-7d0f-8b54-09bffe0b8328" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019cd372-5e3a-7967-9154-25329bc04b21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019cd372-5e3a-7d0f-8b54-09bffe0b8328" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019cd372-5e3a-7967-9154-25329bc04b21" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019cd372-5e3a-7967-9154-25329bc04b21" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5e3a-7be3-9b03-c136eadd002f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5e3a-7af4-9cf8-41a4bb6aaa31" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5e3a-7be3-9b03-c136eadd002f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5e3a-715c-a0a5-fe2c2e04107a" xlink:href="ecg-20260331.xsd#ecg_ElectricalAndMechanicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5e3a-7be3-9b03-c136eadd002f" xlink:to="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5e3a-715c-a0a5-fe2c2e04107a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5e3a-7f9f-a01d-a4b5d43ca748" xlink:href="ecg-20260331.xsd#ecg_TransmissionAndDistributionSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5e3a-7be3-9b03-c136eadd002f" xlink:to="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5e3a-7f9f-a01d-a4b5d43ca748" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019cd372-5e3a-715c-ac7a-ffab24e1d78a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019cd372-5e3a-7d0f-8b54-09bffe0b8328" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019cd372-5e3a-715c-ac7a-ffab24e1d78a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019cd372-5e3a-7139-acc4-0d12c8f52c9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019cd372-5e3a-7d0f-8b54-09bffe0b8328" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019cd372-5e3a-7139-acc4-0d12c8f52c9f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/GoodwillandOtherIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#GoodwillandOtherIntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/GoodwillandOtherIntangibleAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019cd372-5ee6-7b08-b658-5547d21edf61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019cd372-5ee6-74d6-b369-f5bb9a8f79ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019cd372-5ee6-7b08-b658-5547d21edf61" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019cd372-5ee6-74d6-b369-f5bb9a8f79ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee6-7584-a3bd-9c8dbe3162f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019cd372-5ee6-74d6-b369-f5bb9a8f79ae" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee6-7584-a3bd-9c8dbe3162f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee6-7584-a3bd-9c8dbe3162f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee6-7584-a3bd-9c8dbe3162f2" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee6-7584-a3bd-9c8dbe3162f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee6-7e3f-92eb-4dad9a70bf0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee6-7584-a3bd-9c8dbe3162f2" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee6-7e3f-92eb-4dad9a70bf0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee6-7610-928f-b5624ee99dc3" xlink:href="ecg-20260331.xsd#ecg_ElectricalAndMechanicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee6-7e3f-92eb-4dad9a70bf0d" xlink:to="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee6-7610-928f-b5624ee99dc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee6-7959-8947-cdf2e65725a7" xlink:href="ecg-20260331.xsd#ecg_TransmissionAndDistributionSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee6-7e3f-92eb-4dad9a70bf0d" xlink:to="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee6-7959-8947-cdf2e65725a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019cd372-5ee6-724c-9635-bafa74384565" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019cd372-5ee6-7b08-b658-5547d21edf61" xlink:to="loc_us-gaap_Goodwill_019cd372-5ee6-724c-9635-bafa74384565" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_019cd372-5ee6-71d1-9eca-cfbad7bd774f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019cd372-5ee6-7b08-b658-5547d21edf61" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_019cd372-5ee6-71d1-9eca-cfbad7bd774f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019cd372-5ee6-7aca-800b-938ea4680551" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019cd372-5ee6-7b08-b658-5547d21edf61" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019cd372-5ee6-7aca-800b-938ea4680551" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cd372-5ee6-7c35-97ea-b224e7bb2639" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019cd372-5ee6-7b08-b658-5547d21edf61" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cd372-5ee6-7c35-97ea-b224e7bb2639" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_019cd372-5ee6-7a08-a821-4a42b011fef2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019cd372-5ee6-7b08-b658-5547d21edf61" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_019cd372-5ee6-7a08-a821-4a42b011fef2" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7aad-a0ec-6c0d803c98f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd372-5ee7-7a2a-aa60-f1984c0b4c44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7aad-a0ec-6c0d803c98f6" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd372-5ee7-7a2a-aa60-f1984c0b4c44" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019cd372-5ee7-7aef-b31b-5157d4a77121" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd372-5ee7-7a2a-aa60-f1984c0b4c44" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019cd372-5ee7-7aef-b31b-5157d4a77121" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cd372-5ee7-7aef-b31b-5157d4a77121_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019cd372-5ee7-7aef-b31b-5157d4a77121" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cd372-5ee7-7aef-b31b-5157d4a77121_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cd372-5ee7-712f-b81a-f9e5accb29ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019cd372-5ee7-7aef-b31b-5157d4a77121" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cd372-5ee7-712f-b81a-f9e5accb29ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueMember_019cd372-5ee7-735b-84c2-0fe77bb8391a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashSurrenderValueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019cd372-5ee7-712f-b81a-f9e5accb29ba" xlink:to="loc_us-gaap_CashSurrenderValueMember_019cd372-5ee7-735b-84c2-0fe77bb8391a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019cd372-5ee7-752a-ba56-9b91effc5a53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7aad-a0ec-6c0d803c98f6" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019cd372-5ee7-752a-ba56-9b91effc5a53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_019cd372-5ee7-7f1e-94e8-57ac188c25d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7aad-a0ec-6c0d803c98f6" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_019cd372-5ee7-7f1e-94e8-57ac188c25d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_019cd372-5ee7-702c-8c04-5ba6d70024fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfLongLivedAssetsHeldForUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7aad-a0ec-6c0d803c98f6" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_019cd372-5ee7-702c-8c04-5ba6d70024fa" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/FairValueMeasurementsScheduleofAssetsMeasuredonaRecurringBasisDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#FairValueMeasurementsScheduleofAssetsMeasuredonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/FairValueMeasurementsScheduleofAssetsMeasuredonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7c14-98b1-2f9652c71bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd372-5ee7-73a8-bce9-635dab700448" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7c14-98b1-2f9652c71bd2" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd372-5ee7-73a8-bce9-635dab700448" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd372-5ee7-7b0c-afb7-7ac8cd9d7174" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cd372-5ee7-73a8-bce9-635dab700448" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd372-5ee7-7b0c-afb7-7ac8cd9d7174" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd372-5ee7-7b0c-afb7-7ac8cd9d7174_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd372-5ee7-7b0c-afb7-7ac8cd9d7174" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd372-5ee7-7b0c-afb7-7ac8cd9d7174_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd372-5ee7-70c0-9ab8-7042407a8e53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd372-5ee7-7b0c-afb7-7ac8cd9d7174" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd372-5ee7-70c0-9ab8-7042407a8e53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cd372-5ee7-7b3c-8a5a-1f274ae78ed8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd372-5ee7-70c0-9ab8-7042407a8e53" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cd372-5ee7-7b3c-8a5a-1f274ae78ed8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cd372-5ee7-7ca3-8dfe-74942248898a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd372-5ee7-70c0-9ab8-7042407a8e53" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cd372-5ee7-7ca3-8dfe-74942248898a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cd372-5ee7-740a-b54e-07ba9204defc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd372-5ee7-70c0-9ab8-7042407a8e53" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cd372-5ee7-740a-b54e-07ba9204defc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019cd372-5ee7-756c-a32e-33023fb8d097" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7c14-98b1-2f9652c71bd2" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019cd372-5ee7-756c-a32e-33023fb8d097" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019cd372-5ee7-7ded-babb-9693c2533c54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cd372-5ee7-7c14-98b1-2f9652c71bd2" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019cd372-5ee7-7ded-babb-9693c2533c54" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/FairValueMeasurementsAssetsandLiabilitiesNotMeasuredatFairValueDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#FairValueMeasurementsAssetsandLiabilitiesNotMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/FairValueMeasurementsAssetsandLiabilitiesNotMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019cd372-5ee7-7042-84a5-1f25da61045b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019cd372-5ee7-701a-b1d8-2c50dc39e544" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019cd372-5ee7-7042-84a5-1f25da61045b" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019cd372-5ee7-701a-b1d8-2c50dc39e544" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019cd372-5ee7-7f34-a6b2-092a97481b50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019cd372-5ee7-701a-b1d8-2c50dc39e544" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019cd372-5ee7-7f34-a6b2-092a97481b50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cd372-5ee7-7f34-a6b2-092a97481b50_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cd372-5ee7-7f34-a6b2-092a97481b50" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cd372-5ee7-7f34-a6b2-092a97481b50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cd372-5ee7-7372-818a-a8f8f279757d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cd372-5ee7-7f34-a6b2-092a97481b50" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cd372-5ee7-7372-818a-a8f8f279757d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cd372-5ee7-7d2d-b71e-2696079dbee8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cd372-5ee7-7372-818a-a8f8f279757d" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cd372-5ee7-7d2d-b71e-2696079dbee8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019cd372-5ee7-7b41-a1d9-c647a5a11219" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cd372-5ee7-7d2d-b71e-2696079dbee8" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019cd372-5ee7-7b41-a1d9-c647a5a11219" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cd372-5ee7-7404-baa3-854bb101603c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cd372-5ee7-7d2d-b71e-2696079dbee8" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cd372-5ee7-7404-baa3-854bb101603c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019cd372-5ee7-7ed7-b061-b412122e7f0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019cd372-5ee7-7042-84a5-1f25da61045b" xlink:to="loc_us-gaap_LongTermDebtFairValue_019cd372-5ee7-7ed7-b061-b412122e7f0a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/DebtLongTermDebtDetailsDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#DebtLongTermDebtDetailsDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/DebtLongTermDebtDetailsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7a51-b10b-d9349a09379d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7c15-990c-c5be97954338" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7a51-b10b-d9349a09379d" xlink:to="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7c15-990c-c5be97954338" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-732a-8e30-cc2457ae5f79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7c15-990c-c5be97954338" xlink:to="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-732a-8e30-cc2457ae5f79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-732a-8e30-cc2457ae5f79_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-732a-8e30-cc2457ae5f79" xlink:to="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-732a-8e30-cc2457ae5f79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7826-b633-ed6a87ab8513" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-732a-8e30-cc2457ae5f79" xlink:to="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7826-b633-ed6a87ab8513" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019cd372-5ee7-7d64-9699-37977fc0a102" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7826-b633-ed6a87ab8513" xlink:to="loc_us-gaap_SecuredDebtMember_019cd372-5ee7-7d64-9699-37977fc0a102" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019cd372-5ee7-77fe-acfe-5907e28574b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7826-b633-ed6a87ab8513" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019cd372-5ee7-77fe-acfe-5907e28574b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-7921-90fa-08092037662c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7c15-990c-c5be97954338" xlink:to="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-7921-90fa-08092037662c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-7921-90fa-08092037662c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-7921-90fa-08092037662c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-7921-90fa-08092037662c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-7d1f-bb29-9349eac9892d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-7921-90fa-08092037662c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-7d1f-bb29-9349eac9892d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CreditAgreementMember_019cd372-5ee7-7809-ab25-8a81df1bed77" xlink:href="ecg-20260331.xsd#ecg_CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-7d1f-bb29-9349eac9892d" xlink:to="loc_ecg_CreditAgreementMember_019cd372-5ee7-7809-ab25-8a81df1bed77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7cd6-af5e-3abeedac8add" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7c15-990c-c5be97954338" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7cd6-af5e-3abeedac8add" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7cd6-af5e-3abeedac8add_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7cd6-af5e-3abeedac8add" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7cd6-af5e-3abeedac8add_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7726-8802-950daecd8a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7cd6-af5e-3abeedac8add" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7726-8802-950daecd8a0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019cd372-5ee7-7479-8de8-f4fda84d2323" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7726-8802-950daecd8a0b" xlink:to="loc_us-gaap_LineOfCreditMember_019cd372-5ee7-7479-8de8-f4fda84d2323" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_019cd372-5ee7-70a7-8c99-8560e0b9f9c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7a51-b10b-d9349a09379d" xlink:to="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_019cd372-5ee7-70a7-8c99-8560e0b9f9c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019cd372-5ee7-72d2-aff9-08659dcf88a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7a51-b10b-d9349a09379d" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019cd372-5ee7-72d2-aff9-08659dcf88a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019cd372-5ee7-7f29-a06d-9475cf2c02e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7a51-b10b-d9349a09379d" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019cd372-5ee7-7f29-a06d-9475cf2c02e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019cd372-5ee7-7b7e-a816-d7cd7e7401bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7a51-b10b-d9349a09379d" xlink:to="loc_us-gaap_LongTermDebt_019cd372-5ee7-7b7e-a816-d7cd7e7401bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019cd372-5ee7-73b0-b53e-c60b9e6d8580" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7a51-b10b-d9349a09379d" xlink:to="loc_us-gaap_LongTermDebtCurrent_019cd372-5ee7-73b0-b53e-c60b9e6d8580" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019cd372-5ee7-7e83-af24-2cc5b31ad657" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7a51-b10b-d9349a09379d" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019cd372-5ee7-7e83-af24-2cc5b31ad657" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7f65-87ca-2398b5f493d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7f65-87ca-2398b5f493d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-70d7-b830-bec94e4230fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7f65-87ca-2398b5f493d5" xlink:to="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-70d7-b830-bec94e4230fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-70d7-b830-bec94e4230fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-70d7-b830-bec94e4230fb" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-70d7-b830-bec94e4230fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-73eb-beae-eec038a79a33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-70d7-b830-bec94e4230fb" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-73eb-beae-eec038a79a33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CreditAgreementMember_019cd372-5ee7-71f1-b284-59e181e24b67" xlink:href="ecg-20260331.xsd#ecg_CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-73eb-beae-eec038a79a33" xlink:to="loc_ecg_CreditAgreementMember_019cd372-5ee7-71f1-b284-59e181e24b67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7ba0-87c2-03bee598ff8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7f65-87ca-2398b5f493d5" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7ba0-87c2-03bee598ff8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7ba0-87c2-03bee598ff8e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7ba0-87c2-03bee598ff8e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7ba0-87c2-03bee598ff8e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7818-b7b8-a2eda223f0af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7ba0-87c2-03bee598ff8e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7818-b7b8-a2eda223f0af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019cd372-5ee7-7ade-85dd-3459e8096fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7818-b7b8-a2eda223f0af" xlink:to="loc_us-gaap_LineOfCreditMember_019cd372-5ee7-7ade-85dd-3459e8096fd0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-7e1f-97b0-09c5923818b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7f65-87ca-2398b5f493d5" xlink:to="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-7e1f-97b0-09c5923818b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7e1f-97b0-09c5923818b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-7e1f-97b0-09c5923818b8" xlink:to="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7e1f-97b0-09c5923818b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-755d-b71c-6e4005fc8964" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-7e1f-97b0-09c5923818b8" xlink:to="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-755d-b71c-6e4005fc8964" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019cd372-5ee7-774e-8eca-013d53442b36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-755d-b71c-6e4005fc8964" xlink:to="loc_us-gaap_SecuredDebtMember_019cd372-5ee7-774e-8eca-013d53442b36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019cd372-5ee7-76f4-91b8-473f19c65312" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-755d-b71c-6e4005fc8964" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019cd372-5ee7-76f4-91b8-473f19c65312" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019cd372-5ee7-76b2-b44e-2b43a5a3e849" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-755d-b71c-6e4005fc8964" xlink:to="loc_us-gaap_LetterOfCreditMember_019cd372-5ee7-76b2-b44e-2b43a5a3e849" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd372-5ee7-7d75-811a-34c4e3fc2636" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7f65-87ca-2398b5f493d5" xlink:to="loc_srt_RangeAxis_019cd372-5ee7-7d75-811a-34c4e3fc2636" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd372-5ee7-7d75-811a-34c4e3fc2636_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019cd372-5ee7-7d75-811a-34c4e3fc2636" xlink:to="loc_srt_RangeMember_019cd372-5ee7-7d75-811a-34c4e3fc2636_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd372-5ee7-7ba0-9aa1-017da0a8336d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019cd372-5ee7-7d75-811a-34c4e3fc2636" xlink:to="loc_srt_RangeMember_019cd372-5ee7-7ba0-9aa1-017da0a8336d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cd372-5ee7-7916-a609-d369fc2cac2a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cd372-5ee7-7ba0-9aa1-017da0a8336d" xlink:to="loc_srt_MinimumMember_019cd372-5ee7-7916-a609-d369fc2cac2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cd372-5ee7-7fc1-92e8-0d58c8084768" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cd372-5ee7-7ba0-9aa1-017da0a8336d" xlink:to="loc_srt_MaximumMember_019cd372-5ee7-7fc1-92e8-0d58c8084768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019cd372-5ee7-7d4e-bdf4-8ab6dfdb5503" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7f65-87ca-2398b5f493d5" xlink:to="loc_us-gaap_VariableRateAxis_019cd372-5ee7-7d4e-bdf4-8ab6dfdb5503" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019cd372-5ee7-7d4e-bdf4-8ab6dfdb5503_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019cd372-5ee7-7d4e-bdf4-8ab6dfdb5503" xlink:to="loc_us-gaap_VariableRateDomain_019cd372-5ee7-7d4e-bdf4-8ab6dfdb5503_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019cd372-5ee7-72a5-852b-85fa9292b39e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019cd372-5ee7-7d4e-bdf4-8ab6dfdb5503" xlink:to="loc_us-gaap_VariableRateDomain_019cd372-5ee7-72a5-852b-85fa9292b39e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_OvernightBankFundingRateMember_019cd372-5ee7-772d-982c-d7db394a24e5" xlink:href="ecg-20260331.xsd#ecg_OvernightBankFundingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019cd372-5ee7-72a5-852b-85fa9292b39e" xlink:to="loc_ecg_OvernightBankFundingRateMember_019cd372-5ee7-772d-982c-d7db394a24e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019cd372-5ee7-7445-8b0c-6305103706a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019cd372-5ee7-72a5-852b-85fa9292b39e" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019cd372-5ee7-7445-8b0c-6305103706a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019cd372-5ee7-70dc-abf9-ef1534051a34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019cd372-5ee7-72a5-852b-85fa9292b39e" xlink:to="loc_us-gaap_BaseRateMember_019cd372-5ee7-70dc-abf9-ef1534051a34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_019cd372-5ee7-7f67-bd56-617e9c4ed702" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cd372-5ee7-7f65-87ca-2398b5f493d5" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_019cd372-5ee7-7f67-bd56-617e9c4ed702" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7f67-bd56-617e9c4ed702_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_019cd372-5ee7-7f67-bd56-617e9c4ed702" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7f67-bd56-617e9c4ed702_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7787-8dc1-952e8ab6c865" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_019cd372-5ee7-7f67-bd56-617e9c4ed702" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7787-8dc1-952e8ab6c865" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_019cd372-5ee7-7cf7-bcc3-3eac328e742c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7787-8dc1-952e8ab6c865" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_019cd372-5ee7-7cf7-bcc3-3eac328e742c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019cd372-5ee7-7238-bce7-ba5b1603b26c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_DebtInstrumentTerm_019cd372-5ee7-7238-bce7-ba5b1603b26c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019cd372-5ee7-770e-b4b8-d4e0980ad2ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019cd372-5ee7-770e-b4b8-d4e0980ad2ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019cd372-5ee7-7f5f-95d1-d228beb390a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019cd372-5ee7-7f5f-95d1-d228beb390a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019cd372-5ee7-7a99-a264-1bc80aa8515c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019cd372-5ee7-7a99-a264-1bc80aa8515c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019cd372-5ee7-77f7-b192-1e5bb52ad4b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_LongTermDebt_019cd372-5ee7-77f7-b192-1e5bb52ad4b0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019cd372-5ee7-711f-83cf-251b37c7ba2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019cd372-5ee7-711f-83cf-251b37c7ba2c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019cd372-5ee7-7c45-a20c-91895a21901a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_InterestExpenseDebt_019cd372-5ee7-7c45-a20c-91895a21901a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019cd372-5ee7-7f11-9b07-ba98ee434222" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019cd372-5ee7-7f11-9b07-ba98ee434222" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_019cd372-5ee7-7beb-9ffb-217c7f2b3b83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_019cd372-5ee7-7beb-9ffb-217c7f2b3b83" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_019cd372-5ee7-7df5-8095-39a4c0a03c51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeeAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_019cd372-5ee7-7df5-8095-39a4c0a03c51" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_DebtInstrumentPeriodicPaymentAnnualPercentageOfPrincipalAmount_019cd372-5ee7-7b44-a767-24b6ee1d54c2" xlink:href="ecg-20260331.xsd#ecg_DebtInstrumentPeriodicPaymentAnnualPercentageOfPrincipalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_ecg_DebtInstrumentPeriodicPaymentAnnualPercentageOfPrincipalAmount_019cd372-5ee7-7b44-a767-24b6ee1d54c2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_019cd372-5ee7-7b86-8078-a0d5e8372573" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_019cd372-5ee7-7b86-8078-a0d5e8372573" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentInterest_019cd372-5ee7-7ecf-9503-05820cc74011" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentPeriodicPaymentInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentInterest_019cd372-5ee7-7ecf-9503-05820cc74011" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019cd372-5ee7-764f-9a88-9dd6c2b8a30f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019cd372-5ee7-764f-9a88-9dd6c2b8a30f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019cd372-5ee7-7374-bc6d-9b040902b66f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019cd372-5ee7-7374-bc6d-9b040902b66f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_DebtInstrumentCovenantConsolidatedTotalNetLeverageRatioMaximum_019cd372-5ee7-76f3-8502-88b8e5b5eac4" xlink:href="ecg-20260331.xsd#ecg_DebtInstrumentCovenantConsolidatedTotalNetLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_ecg_DebtInstrumentCovenantConsolidatedTotalNetLeverageRatioMaximum_019cd372-5ee7-76f3-8502-88b8e5b5eac4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_DebtInstrumentCovenantInterestCoverageRatioMinimum_019cd372-5ee7-7ed5-bd0c-e8a984a767c2" xlink:href="ecg-20260331.xsd#ecg_DebtInstrumentCovenantInterestCoverageRatioMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_ecg_DebtInstrumentCovenantInterestCoverageRatioMinimum_019cd372-5ee7-7ed5-bd0c-e8a984a767c2" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_DebtInstrumentCovenantNetLeverageRatioMaximumIncrease_019cd372-5ee7-76b8-b14d-125c362693c1" xlink:href="ecg-20260331.xsd#ecg_DebtInstrumentCovenantNetLeverageRatioMaximumIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cd372-5ee7-7602-8ee0-b0b0220245b1" xlink:to="loc_ecg_DebtInstrumentCovenantNetLeverageRatioMaximumIncrease_019cd372-5ee7-76b8-b14d-125c362693c1" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd372-5ee7-765d-95c4-8a81cf639b00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019cd372-5ee7-739b-9cb7-b26b0f70cfce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd372-5ee7-765d-95c4-8a81cf639b00" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019cd372-5ee7-739b-9cb7-b26b0f70cfce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019cd372-5ee7-7f6f-839b-168a134a3724" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019cd372-5ee7-739b-9cb7-b26b0f70cfce" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019cd372-5ee7-7f6f-839b-168a134a3724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd372-5ee7-7f6f-839b-168a134a3724_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019cd372-5ee7-7f6f-839b-168a134a3724" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd372-5ee7-7f6f-839b-168a134a3724_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd372-5ee7-78e6-afa7-374ee3538ea7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019cd372-5ee7-7f6f-839b-168a134a3724" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd372-5ee7-78e6-afa7-374ee3538ea7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_019cd372-5ee7-7b64-be4d-d8c078f3f325" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd372-5ee7-78e6-afa7-374ee3538ea7" xlink:to="loc_us-gaap_VehiclesMember_019cd372-5ee7-7b64-be4d-d8c078f3f325" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_019cd372-5ee7-7272-9122-bb2bd614c02e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd372-5ee7-78e6-afa7-374ee3538ea7" xlink:to="loc_us-gaap_EquipmentMember_019cd372-5ee7-7272-9122-bb2bd614c02e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_019cd372-5ee7-7ec7-bd7a-4589ca205ae2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019cd372-5ee7-78e6-afa7-374ee3538ea7" xlink:to="loc_us-gaap_BuildingMember_019cd372-5ee7-7ec7-bd7a-4589ca205ae2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd372-5ee7-7f96-803e-de5195b7464e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019cd372-5ee7-739b-9cb7-b26b0f70cfce" xlink:to="loc_srt_RangeAxis_019cd372-5ee7-7f96-803e-de5195b7464e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd372-5ee7-7f96-803e-de5195b7464e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019cd372-5ee7-7f96-803e-de5195b7464e" xlink:to="loc_srt_RangeMember_019cd372-5ee7-7f96-803e-de5195b7464e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd372-5ee7-7b88-bc27-59a8e5227fd0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019cd372-5ee7-7f96-803e-de5195b7464e" xlink:to="loc_srt_RangeMember_019cd372-5ee7-7b88-bc27-59a8e5227fd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cd372-5ee7-7b4a-9037-4d7711ab9349" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cd372-5ee7-7b88-bc27-59a8e5227fd0" xlink:to="loc_srt_MaximumMember_019cd372-5ee7-7b4a-9037-4d7711ab9349" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cd372-5ee7-7c96-843d-dccc383882b0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cd372-5ee7-7b88-bc27-59a8e5227fd0" xlink:to="loc_srt_MinimumMember_019cd372-5ee7-7c96-843d-dccc383882b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019d9302-e7ae-7a7d-8cbb-e788f08d77a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019cd372-5ee7-739b-9cb7-b26b0f70cfce" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019d9302-e7ae-7a7d-8cbb-e788f08d77a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019d9302-e7ae-7a7d-8cbb-e788f08d77a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019d9302-e7ae-7a7d-8cbb-e788f08d77a7" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019d9302-e7ae-7a7d-8cbb-e788f08d77a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019d9302-e7ae-7b95-bb9a-e55bf300afd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019d9302-e7ae-7a7d-8cbb-e788f08d77a7" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019d9302-e7ae-7b95-bb9a-e55bf300afd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseNotYetCommencedMember_019d9303-1bad-778c-a37c-1e4667a91af5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLeaseNotYetCommencedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019d9302-e7ae-7b95-bb9a-e55bf300afd1" xlink:to="loc_us-gaap_OperatingLeaseLeaseNotYetCommencedMember_019d9303-1bad-778c-a37c-1e4667a91af5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019cd372-5ee7-7ebb-bb69-dfc0d66cd9fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd372-5ee7-765d-95c4-8a81cf639b00" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019cd372-5ee7-7ebb-bb69-dfc0d66cd9fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_LesseeOperatingLeaseNumberOfRenewalOptions_019cd372-5ee7-7d20-8090-15772618adae" xlink:href="ecg-20260331.xsd#ecg_LesseeOperatingLeaseNumberOfRenewalOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd372-5ee7-765d-95c4-8a81cf639b00" xlink:to="loc_ecg_LesseeOperatingLeaseNumberOfRenewalOptions_019cd372-5ee7-7d20-8090-15772618adae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_019cd372-5ee7-7004-970a-7e36f70862bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd372-5ee7-765d-95c4-8a81cf639b00" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_019cd372-5ee7-7004-970a-7e36f70862bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019d9301-685f-79c2-9e8d-51ec05ed214a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd372-5ee7-765d-95c4-8a81cf639b00" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019d9301-685f-79c2-9e8d-51ec05ed214a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_019df625-a96d-7fde-9c02-9b5a789a4cf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019cd372-5ee7-765d-95c4-8a81cf639b00" xlink:to="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_019df625-a96d-7fde-9c02-9b5a789a4cf3" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/StockBasedCompensationDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#StockBasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/StockBasedCompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd372-5ee7-78a4-bd36-1e08c6b0637a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd372-5ee7-78a4-bd36-1e08c6b0637a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cd372-5ee7-7be4-90b8-07bac1a49b36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd372-5ee7-78a4-bd36-1e08c6b0637a" xlink:to="loc_us-gaap_AwardTypeAxis_019cd372-5ee7-7be4-90b8-07bac1a49b36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd372-5ee7-7be4-90b8-07bac1a49b36_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019cd372-5ee7-7be4-90b8-07bac1a49b36" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd372-5ee7-7be4-90b8-07bac1a49b36_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd372-5ee7-7078-af4b-c4246e930b7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019cd372-5ee7-7be4-90b8-07bac1a49b36" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd372-5ee7-7078-af4b-c4246e930b7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd372-5ee7-7f54-bc37-89262f7aafef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd372-5ee7-7078-af4b-c4246e930b7f" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019cd372-5ee7-7f54-bc37-89262f7aafef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_019cd372-5ee7-7b23-b69d-defcca68086c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd372-5ee7-7078-af4b-c4246e930b7f" xlink:to="loc_us-gaap_PerformanceSharesMember_019cd372-5ee7-7b23-b69d-defcca68086c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_PerformanceSharesSubjectToPerformanceConditionsMember_019cd372-5ee7-7be6-8e6e-035b439b85c7" xlink:href="ecg-20260331.xsd#ecg_PerformanceSharesSubjectToPerformanceConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PerformanceSharesMember_019cd372-5ee7-7b23-b69d-defcca68086c" xlink:to="loc_ecg_PerformanceSharesSubjectToPerformanceConditionsMember_019cd372-5ee7-7be6-8e6e-035b439b85c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_PerformanceSharesSubjectToMarketConditionsMember_019cd372-5ee7-7b85-860a-2f3f821cf240" xlink:href="ecg-20260331.xsd#ecg_PerformanceSharesSubjectToMarketConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PerformanceSharesMember_019cd372-5ee7-7b23-b69d-defcca68086c" xlink:to="loc_ecg_PerformanceSharesSubjectToMarketConditionsMember_019cd372-5ee7-7b85-860a-2f3f821cf240" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_OtherStockAwardsMember_019cd372-5ee7-7667-93b4-2a2894367413" xlink:href="ecg-20260331.xsd#ecg_OtherStockAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd372-5ee7-7078-af4b-c4246e930b7f" xlink:to="loc_ecg_OtherStockAwardsMember_019cd372-5ee7-7667-93b4-2a2894367413" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cd372-5ee7-72ce-b19e-f57ad1a84909" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd372-5ee7-78a4-bd36-1e08c6b0637a" xlink:to="loc_srt_RangeAxis_019cd372-5ee7-72ce-b19e-f57ad1a84909" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd372-5ee7-72ce-b19e-f57ad1a84909_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019cd372-5ee7-72ce-b19e-f57ad1a84909" xlink:to="loc_srt_RangeMember_019cd372-5ee7-72ce-b19e-f57ad1a84909_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cd372-5ee7-7a01-81b4-59ec28daaa76" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019cd372-5ee7-72ce-b19e-f57ad1a84909" xlink:to="loc_srt_RangeMember_019cd372-5ee7-7a01-81b4-59ec28daaa76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cd372-5ee7-716e-ae10-8478b9ccd9f6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cd372-5ee7-7a01-81b4-59ec28daaa76" xlink:to="loc_srt_MinimumMember_019cd372-5ee7-716e-ae10-8478b9ccd9f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cd372-5ee7-70db-87f8-7833e5ae7e18" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cd372-5ee7-7a01-81b4-59ec28daaa76" xlink:to="loc_srt_MaximumMember_019cd372-5ee7-70db-87f8-7833e5ae7e18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cd372-5ee7-73c8-9df7-5a085230380e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd372-5ee7-78a4-bd36-1e08c6b0637a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cd372-5ee7-73c8-9df7-5a085230380e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cd372-5ee7-73c8-9df7-5a085230380e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cd372-5ee7-73c8-9df7-5a085230380e" xlink:to="loc_us-gaap_EquityComponentDomain_019cd372-5ee7-73c8-9df7-5a085230380e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cd372-5ee7-7b67-bdaf-726a208bd3e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cd372-5ee7-73c8-9df7-5a085230380e" xlink:to="loc_us-gaap_EquityComponentDomain_019cd372-5ee7-7b67-bdaf-726a208bd3e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cd372-5ee7-793f-8f05-c43cfacbd067" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cd372-5ee7-7b67-bdaf-726a208bd3e2" xlink:to="loc_us-gaap_CommonStockMember_019cd372-5ee7-793f-8f05-c43cfacbd067" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_019cd372-5ee7-7a55-99e8-43d67529291a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd372-5ee7-78a4-bd36-1e08c6b0637a" xlink:to="loc_us-gaap_VestingAxis_019cd372-5ee7-7a55-99e8-43d67529291a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019cd372-5ee7-7a55-99e8-43d67529291a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_019cd372-5ee7-7a55-99e8-43d67529291a" xlink:to="loc_us-gaap_VestingDomain_019cd372-5ee7-7a55-99e8-43d67529291a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019cd372-5ee7-7488-86a9-3225f12dcbe4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_019cd372-5ee7-7a55-99e8-43d67529291a" xlink:to="loc_us-gaap_VestingDomain_019cd372-5ee7-7488-86a9-3225f12dcbe4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019cd372-5ee7-7871-bb97-a01469ca5e58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_019cd372-5ee7-7488-86a9-3225f12dcbe4" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019cd372-5ee7-7871-bb97-a01469ca5e58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_019cd372-5ee7-771d-aa52-13eaf2e33ba2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_019cd372-5ee7-7488-86a9-3225f12dcbe4" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_019cd372-5ee7-771d-aa52-13eaf2e33ba2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_019cd372-5ee7-744a-a2eb-b55176b01b80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_019cd372-5ee7-7488-86a9-3225f12dcbe4" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_019cd372-5ee7-744a-a2eb-b55176b01b80" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019cd372-5ee7-76fd-b9a4-c525d9ffd9fd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd372-5ee7-78a4-bd36-1e08c6b0637a" xlink:to="loc_srt_TitleOfIndividualAxis_019cd372-5ee7-76fd-b9a4-c525d9ffd9fd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd372-5ee7-76fd-b9a4-c525d9ffd9fd_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_019cd372-5ee7-76fd-b9a4-c525d9ffd9fd" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd372-5ee7-76fd-b9a4-c525d9ffd9fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd372-5ee7-7ffd-88c9-0f285a8b25a0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_019cd372-5ee7-76fd-b9a4-c525d9ffd9fd" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd372-5ee7-7ffd-88c9-0f285a8b25a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_DirectorMember_019cd372-5ee7-7449-87c9-ce84ae212c76" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_DirectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cd372-5ee7-7ffd-88c9-0f285a8b25a0" xlink:to="loc_srt_DirectorMember_019cd372-5ee7-7449-87c9-ce84ae212c76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019d9304-74bb-7be2-8b0a-b25c316222c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cd372-5ee7-78a4-bd36-1e08c6b0637a" xlink:to="loc_us-gaap_PlanNameAxis_019d9304-74bb-7be2-8b0a-b25c316222c0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019d9304-74bb-7be2-8b0a-b25c316222c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019d9304-74bb-7be2-8b0a-b25c316222c0" xlink:to="loc_us-gaap_PlanNameDomain_019d9304-74bb-7be2-8b0a-b25c316222c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019d9304-74bb-7dd6-8028-fa5d0300e21f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019d9304-74bb-7be2-8b0a-b25c316222c0" xlink:to="loc_us-gaap_PlanNameDomain_019d9304-74bb-7dd6-8028-fa5d0300e21f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_LongTermIncentivePlanMember_019d9304-bbcb-710f-8b1b-d27bd0b09cad" xlink:href="ecg-20260331.xsd#ecg_LongTermIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019d9304-74bb-7dd6-8028-fa5d0300e21f" xlink:to="loc_ecg_LongTermIncentivePlanMember_019d9304-bbcb-710f-8b1b-d27bd0b09cad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019cd372-5ee7-7fb1-ae19-6ccb1f9c9d06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019cd372-5ee7-7fb1-ae19-6ccb1f9c9d06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForIssuance_019df94e-59ca-79f5-ba56-0a3ab1aeae19" xlink:href="ecg-20260331.xsd#ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForIssuance_019df94e-59ca-79f5-ba56-0a3ab1aeae19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019cd372-5ee7-7354-8ed7-1c494ba9eab6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019cd372-5ee7-7354-8ed7-1c494ba9eab6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesGrantedAndUnsettled_019df94f-8b92-7cf2-9119-d9f846a49c5c" xlink:href="ecg-20260331.xsd#ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesGrantedAndUnsettled"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesGrantedAndUnsettled_019df94f-8b92-7cf2-9119-d9f846a49c5c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019cd372-5ee7-7ee2-9903-db0204927d6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019cd372-5ee7-7ee2-9903-db0204927d6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd372-5ee7-79e2-8e7a-8ff193627d38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd372-5ee7-79e2-8e7a-8ff193627d38" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019cd372-5ee7-7e26-b00e-9077a7f188b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019cd372-5ee7-7e26-b00e-9077a7f188b0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_019cd372-5ee7-7e4e-9130-9889b344068f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_019cd372-5ee7-7e4e-9130-9889b344068f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019cd372-5ee7-797b-b734-180b0dae3927" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019cd372-5ee7-797b-b734-180b0dae3927" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019cd372-5ee7-7da7-8052-68f402ccc4d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019cd372-5ee7-7da7-8052-68f402ccc4d2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_019cd372-5ee7-760f-a2b9-bed4e3664f0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_019cd372-5ee7-760f-a2b9-bed4e3664f0b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_019cd372-5ee7-7cd8-9e66-1676726c9aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_019cd372-5ee7-7cd8-9e66-1676726c9aa9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019df950-b790-70bd-a524-8e58aa2b2caa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019df950-b790-70bd-a524-8e58aa2b2caa" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceTargetAllocationPercentage_019cd372-5ee7-74e0-9d20-f1c5f2e7326d" xlink:href="ecg-20260331.xsd#ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceTargetAllocationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceTargetAllocationPercentage_019cd372-5ee7-74e0-9d20-f1c5f2e7326d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMarketTargetAllocationPercentage_019cd372-5ee7-724c-a376-2cd5ef03bcc5" xlink:href="ecg-20260331.xsd#ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMarketTargetAllocationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd372-5ee7-7379-8556-76139a4760dd" xlink:to="loc_ecg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMarketTargetAllocationPercentage_019cd372-5ee7-724c-a376-2cd5ef03bcc5" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/SegmentInformationNarrativeDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#SegmentInformationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/SegmentInformationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-718c-a32d-eaf32af72bf1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-741f-9a28-e3bfc2dea7f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-718c-a32d-eaf32af72bf1" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-741f-9a28-e3bfc2dea7f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-74d6-bbf4-0ae07a616f64" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-741f-9a28-e3bfc2dea7f4" xlink:to="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-74d6-bbf4-0ae07a616f64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-74d6-bbf4-0ae07a616f64_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-74d6-bbf4-0ae07a616f64" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-74d6-bbf4-0ae07a616f64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7b5b-96cc-f2c6d93ba0e2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-74d6-bbf4-0ae07a616f64" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7b5b-96cc-f2c6d93ba0e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019cd372-5ee7-7534-b5c1-270e4200beee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7b5b-96cc-f2c6d93ba0e2" xlink:to="loc_us-gaap_OperatingSegmentsMember_019cd372-5ee7-7534-b5c1-270e4200beee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7337-b67a-a7d8db7113ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-741f-9a28-e3bfc2dea7f4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7337-b67a-a7d8db7113ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee7-7337-b67a-a7d8db7113ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7337-b67a-a7d8db7113ec" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee7-7337-b67a-a7d8db7113ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee7-714b-bf60-4509dd3c7590" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7337-b67a-a7d8db7113ec" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee7-714b-bf60-4509dd3c7590" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee7-71e1-a7cf-442c93ef3f74" xlink:href="ecg-20260331.xsd#ecg_ElectricalAndMechanicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee7-714b-bf60-4509dd3c7590" xlink:to="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee7-71e1-a7cf-442c93ef3f74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee7-7abe-a057-76d50a937a48" xlink:href="ecg-20260331.xsd#ecg_TransmissionAndDistributionSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee7-714b-bf60-4509dd3c7590" xlink:to="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee7-7abe-a057-76d50a937a48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019cd372-5ee7-7c0b-96af-0ffa1fc3c519" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-741f-9a28-e3bfc2dea7f4" xlink:to="loc_srt_MajorCustomersAxis_019cd372-5ee7-7c0b-96af-0ffa1fc3c519" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cd372-5ee7-7c0b-96af-0ffa1fc3c519_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019cd372-5ee7-7c0b-96af-0ffa1fc3c519" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cd372-5ee7-7c0b-96af-0ffa1fc3c519_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cd372-5ee7-7020-a887-1fbc5cdea80e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019cd372-5ee7-7c0b-96af-0ffa1fc3c519" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cd372-5ee7-7020-a887-1fbc5cdea80e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_SingleCustomerMember_019cd372-5ee7-7637-aba0-fb643ef82d50" xlink:href="ecg-20260331.xsd#ecg_SingleCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5ee7-7020-a887-1fbc5cdea80e" xlink:to="loc_ecg_SingleCustomerMember_019cd372-5ee7-7637-aba0-fb643ef82d50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CustomerOneMember_019cd372-5ee7-7461-a0ee-1547586a032c" xlink:href="ecg-20260331.xsd#ecg_CustomerOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5ee7-7020-a887-1fbc5cdea80e" xlink:to="loc_ecg_CustomerOneMember_019cd372-5ee7-7461-a0ee-1547586a032c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CustomerTwoMember_019cd372-5ee7-7179-9442-0154b6ad4231" xlink:href="ecg-20260331.xsd#ecg_CustomerTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cd372-5ee7-7020-a887-1fbc5cdea80e" xlink:to="loc_ecg_CustomerTwoMember_019cd372-5ee7-7179-9442-0154b6ad4231" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cd372-5ee7-7abd-b137-5d5410385df0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-741f-9a28-e3bfc2dea7f4" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cd372-5ee7-7abd-b137-5d5410385df0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cd372-5ee7-7abd-b137-5d5410385df0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cd372-5ee7-7abd-b137-5d5410385df0" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cd372-5ee7-7abd-b137-5d5410385df0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cd372-5ee7-7ff9-85ea-f9780ae4f9e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cd372-5ee7-7abd-b137-5d5410385df0" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cd372-5ee7-7ff9-85ea-f9780ae4f9e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerSegmentBenchmarkMember_019cd372-5ee7-70ee-b9be-ca2b7c2d0044" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerSegmentBenchmarkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cd372-5ee7-7ff9-85ea-f9780ae4f9e8" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerSegmentBenchmarkMember_019cd372-5ee7-70ee-b9be-ca2b7c2d0044" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_019cd372-5ee7-729c-874f-0cddc0afd70f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cd372-5ee7-7ff9-85ea-f9780ae4f9e8" xlink:to="loc_us-gaap_AccountsReceivableMember_019cd372-5ee7-729c-874f-0cddc0afd70f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019cd372-5ee7-7392-860b-9a4c71c69c21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-741f-9a28-e3bfc2dea7f4" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019cd372-5ee7-7392-860b-9a4c71c69c21" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cd372-5ee7-7392-860b-9a4c71c69c21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cd372-5ee7-7392-860b-9a4c71c69c21" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cd372-5ee7-7392-860b-9a4c71c69c21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cd372-5ee7-7efc-a357-d1a8798d58dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cd372-5ee7-7392-860b-9a4c71c69c21" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cd372-5ee7-7efc-a357-d1a8798d58dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019cd372-5ee7-7d3f-b6bb-5cd1cb9fa0a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019cd372-5ee7-7efc-a357-d1a8798d58dc" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019cd372-5ee7-7d3f-b6bb-5cd1cb9fa0a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_019cd372-5ee7-7669-83ac-170a6fac74f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-718c-a32d-eaf32af72bf1" xlink:to="loc_us-gaap_NumberOfOperatingSegments_019cd372-5ee7-7669-83ac-170a6fac74f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019cd372-5ee7-78c4-b764-2815254fcddb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-718c-a32d-eaf32af72bf1" xlink:to="loc_us-gaap_NumberOfReportableSegments_019cd372-5ee7-78c4-b764-2815254fcddb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019cd372-5ee7-7445-ab0c-53d05d33f684" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-718c-a32d-eaf32af72bf1" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019cd372-5ee7-7445-ab0c-53d05d33f684" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/SegmentInformationSummaryofOperatingIncomeDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#SegmentInformationSummaryofOperatingIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/SegmentInformationSummaryofOperatingIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-719e-bb85-327aa3c84c5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-719e-bb85-327aa3c84c5b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7a0b-a7ea-b8802d7d3ab4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-719e-bb85-327aa3c84c5b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7a0b-a7ea-b8802d7d3ab4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee7-7a0b-a7ea-b8802d7d3ab4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7a0b-a7ea-b8802d7d3ab4" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee7-7a0b-a7ea-b8802d7d3ab4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee7-7488-9008-c7d0a18cf6c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7a0b-a7ea-b8802d7d3ab4" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee7-7488-9008-c7d0a18cf6c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee7-7b91-9ae9-8ae52853f8d9" xlink:href="ecg-20260331.xsd#ecg_ElectricalAndMechanicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee7-7488-9008-c7d0a18cf6c4" xlink:to="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee7-7b91-9ae9-8ae52853f8d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee7-767b-9770-e1c9b607fe63" xlink:href="ecg-20260331.xsd#ecg_TransmissionAndDistributionSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee7-7488-9008-c7d0a18cf6c4" xlink:to="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee7-767b-9770-e1c9b607fe63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-7253-9ce2-d8e0b2ba5043" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-719e-bb85-327aa3c84c5b" xlink:to="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-7253-9ce2-d8e0b2ba5043" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7253-9ce2-d8e0b2ba5043_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-7253-9ce2-d8e0b2ba5043" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7253-9ce2-d8e0b2ba5043_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7e73-95bb-9eb0c176b26e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-7253-9ce2-d8e0b2ba5043" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7e73-95bb-9eb0c176b26e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019cd372-5ee7-77ea-9b41-97025590d752" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7e73-95bb-9eb0c176b26e" xlink:to="loc_us-gaap_OperatingSegmentsMember_019cd372-5ee7-77ea-9b41-97025590d752" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019cd372-5ee7-7813-8fe1-376c79fb5e0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7e73-95bb-9eb0c176b26e" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019cd372-5ee7-7813-8fe1-376c79fb5e0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationEliminationsMember_019ddabe-3e66-7524-9366-b690b1befcb1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationEliminationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7e73-95bb-9eb0c176b26e" xlink:to="loc_srt_ConsolidationEliminationsMember_019ddabe-3e66-7524-9366-b690b1befcb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019cd372-5ee7-7188-8192-f2ec3cb998c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7e73-95bb-9eb0c176b26e" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019cd372-5ee7-7188-8192-f2ec3cb998c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019dda87-5410-72da-9bdb-a871c76b2c02" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-719e-bb85-327aa3c84c5b" xlink:to="loc_srt_StatementScenarioAxis_019dda87-5410-72da-9bdb-a871c76b2c02" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dda87-5410-72da-9bdb-a871c76b2c02_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019dda87-5410-72da-9bdb-a871c76b2c02" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dda87-5410-72da-9bdb-a871c76b2c02_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dda87-5410-7f71-ae9d-b71c907d4a1d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019dda87-5410-72da-9bdb-a871c76b2c02" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dda87-5410-7f71-ae9d-b71c907d4a1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProFormaMember_019dda87-7d07-75f5-8efb-7cdccd12629a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProFormaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019dda87-5410-7f71-ae9d-b71c907d4a1d" xlink:to="loc_srt_ProFormaMember_019dda87-7d07-75f5-8efb-7cdccd12629a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cd372-5ee7-7b75-9d09-2222169f5b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019cd372-5ee7-7b75-9d09-2222169f5b0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019cd372-5ee7-7872-8909-82fa9c4034f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019cd372-5ee7-7872-8909-82fa9c4034f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019cd372-5ee7-7d68-b081-ae183103ad98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_GrossProfit_019cd372-5ee7-7d68-b081-ae183103ad98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019cd372-5ee7-7b32-85a3-6a9b64045aff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019cd372-5ee7-7b32-85a3-6a9b64045aff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019cd372-5ee7-7408-be53-a304b57c5d0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_OperatingIncomeLoss_019cd372-5ee7-7408-be53-a304b57c5d0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_019cd372-5ee7-72ae-88a0-a75e20c01cba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_InvestmentIncomeInterest_019cd372-5ee7-72ae-88a0-a75e20c01cba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019cd372-5ee7-7daf-8540-63b30a31bd19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019cd372-5ee7-7daf-8540-63b30a31bd19" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019cd372-5ee7-75b1-8eaa-39a119696d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019cd372-5ee7-75b1-8eaa-39a119696d1b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_019cd372-5ee7-7d85-af0c-4238b9518a42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7a8e-be8a-b9997bb3ed34" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_019cd372-5ee7-7d85-af0c-4238b9518a42" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/SegmentInformationSummaryofSegmentReportingInformationbySegmentDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#SegmentInformationSummaryofSegmentReportingInformationbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/SegmentInformationSummaryofSegmentReportingInformationbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7d77-a8fe-6e0a75198b14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-7fa0-9ab2-ecf4e77a24f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7d77-a8fe-6e0a75198b14" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-7fa0-9ab2-ecf4e77a24f7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7473-aec0-813445ba0730" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-7fa0-9ab2-ecf4e77a24f7" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7473-aec0-813445ba0730" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee7-7473-aec0-813445ba0730_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7473-aec0-813445ba0730" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee7-7473-aec0-813445ba0730_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee7-7911-a948-65ad47df834f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-7473-aec0-813445ba0730" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee7-7911-a948-65ad47df834f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee7-7af4-89df-351fb99df727" xlink:href="ecg-20260331.xsd#ecg_ElectricalAndMechanicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee7-7911-a948-65ad47df834f" xlink:to="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee7-7af4-89df-351fb99df727" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee7-7a8c-a63f-5df353ccaae9" xlink:href="ecg-20260331.xsd#ecg_TransmissionAndDistributionSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee7-7911-a948-65ad47df834f" xlink:to="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee7-7a8c-a63f-5df353ccaae9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-7063-892d-d9f9f3bc3c87" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-7fa0-9ab2-ecf4e77a24f7" xlink:to="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-7063-892d-d9f9f3bc3c87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7063-892d-d9f9f3bc3c87_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-7063-892d-d9f9f3bc3c87" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7063-892d-d9f9f3bc3c87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7ee3-a72c-3a0d75fa1416" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-7063-892d-d9f9f3bc3c87" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7ee3-a72c-3a0d75fa1416" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019cd372-5ee7-7a0a-b1fd-f1348d66e859" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-7ee3-a72c-3a0d75fa1416" xlink:to="loc_us-gaap_OperatingSegmentsMember_019cd372-5ee7-7a0a-b1fd-f1348d66e859" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019cd372-5ee7-7f2b-87dc-c79b06ab9d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7d77-a8fe-6e0a75198b14" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019cd372-5ee7-7f2b-87dc-c79b06ab9d9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019cd372-5ee7-7619-b8f3-b90082b6d0de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7d77-a8fe-6e0a75198b14" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019cd372-5ee7-7619-b8f3-b90082b6d0de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019cd372-5ee7-7009-b4a7-95ab6885a9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7d77-a8fe-6e0a75198b14" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019cd372-5ee7-7009-b4a7-95ab6885a9a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019cd372-5ee7-7b62-96d0-ae2f9c2f139d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7d77-a8fe-6e0a75198b14" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019cd372-5ee7-7b62-96d0-ae2f9c2f139d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/SegmentInformationSummaryofSegmentAssetsDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#SegmentInformationSummaryofSegmentAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/SegmentInformationSummaryofSegmentAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7422-91b4-27c15933d8d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-7e08-8e8b-43a538f3ae3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7422-91b4-27c15933d8d7" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-7e08-8e8b-43a538f3ae3b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-75b9-a082-536d848e9b33" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-7e08-8e8b-43a538f3ae3b" xlink:to="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-75b9-a082-536d848e9b33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-75b9-a082-536d848e9b33_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-75b9-a082-536d848e9b33" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-75b9-a082-536d848e9b33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-76a9-9786-1ea4385a8139" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019cd372-5ee7-75b9-a082-536d848e9b33" xlink:to="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-76a9-9786-1ea4385a8139" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019cd372-5ee7-7740-bf23-92530f4a7713" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-76a9-9786-1ea4385a8139" xlink:to="loc_us-gaap_OperatingSegmentsMember_019cd372-5ee7-7740-bf23-92530f4a7713" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019cd372-5ee7-7d83-b2e7-0d9197826e42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-76a9-9786-1ea4385a8139" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019cd372-5ee7-7d83-b2e7-0d9197826e42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019cd372-5ee7-7257-837d-c2b34f7dd8a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019cd372-5ee7-76a9-9786-1ea4385a8139" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019cd372-5ee7-7257-837d-c2b34f7dd8a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-799c-852b-05aa522b9d9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cd372-5ee7-7e08-8e8b-43a538f3ae3b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-799c-852b-05aa522b9d9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee7-799c-852b-05aa522b9d9d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-799c-852b-05aa522b9d9d" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee7-799c-852b-05aa522b9d9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cd372-5ee7-7cee-922f-58ffc561e7e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cd372-5ee7-799c-852b-05aa522b9d9d" xlink:to="loc_us-gaap_SegmentDomain_019cd372-5ee7-7cee-922f-58ffc561e7e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee7-7435-a333-f94b1d6aa2e6" xlink:href="ecg-20260331.xsd#ecg_ElectricalAndMechanicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee7-7cee-922f-58ffc561e7e5" xlink:to="loc_ecg_ElectricalAndMechanicalSegmentMember_019cd372-5ee7-7435-a333-f94b1d6aa2e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee7-785c-965a-cae4a7b97618" xlink:href="ecg-20260331.xsd#ecg_TransmissionAndDistributionSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cd372-5ee7-7cee-922f-58ffc561e7e5" xlink:to="loc_ecg_TransmissionAndDistributionSegmentMember_019cd372-5ee7-785c-965a-cae4a7b97618" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019cd372-5ee7-7158-b3e1-1e249fcbcf31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cd372-5ee7-7422-91b4-27c15933d8d7" xlink:to="loc_us-gaap_Assets_019cd372-5ee7-7158-b3e1-1e249fcbcf31" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/CommitmentsContingenciesandGuaranteesDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#CommitmentsContingenciesandGuaranteesDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/CommitmentsContingenciesandGuaranteesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019cd372-5ee7-797e-9155-40e46e296446" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_us-gaap_LossContingenciesTable_019cd372-5ee7-797e-9155-40e46e296446" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-76e0-b1e4-a78804509f04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cd372-5ee7-797e-9155-40e46e296446" xlink:to="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-76e0-b1e4-a78804509f04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-76e0-b1e4-a78804509f04_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-76e0-b1e4-a78804509f04" xlink:to="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-76e0-b1e4-a78804509f04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7d69-b941-854b34ace765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019cd372-5ee7-76e0-b1e4-a78804509f04" xlink:to="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7d69-b941-854b34ace765" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019cd372-5ee7-722b-b65f-57ae3003bdd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019cd372-5ee7-7d69-b941-854b34ace765" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019cd372-5ee7-722b-b65f-57ae3003bdd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_019cd372-5ee7-736c-bf7d-caf1815f9aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cd372-5ee7-797e-9155-40e46e296446" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_019cd372-5ee7-736c-bf7d-caf1815f9aa6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-736c-bf7d-caf1815f9aa6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_019cd372-5ee7-736c-bf7d-caf1815f9aa6" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-736c-bf7d-caf1815f9aa6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7142-9a04-71c3a1d1e249" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_019cd372-5ee7-736c-bf7d-caf1815f9aa6" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7142-9a04-71c3a1d1e249" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SuretyBondMember_019cd372-5ee7-7919-b9cb-c26d8ea66270" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SuretyBondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7142-9a04-71c3a1d1e249" xlink:to="loc_us-gaap_SuretyBondMember_019cd372-5ee7-7919-b9cb-c26d8ea66270" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceGuaranteeMember_019cd372-5ee7-7499-b009-c669b455e72e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7142-9a04-71c3a1d1e249" xlink:to="loc_us-gaap_PerformanceGuaranteeMember_019cd372-5ee7-7499-b009-c669b455e72e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_019cd372-5ee7-79de-be49-e3943ad77760" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_019cd372-5ee7-7142-9a04-71c3a1d1e249" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_019cd372-5ee7-79de-be49-e3943ad77760" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-74c8-bb79-5b38ebf8bc45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cd372-5ee7-797e-9155-40e46e296446" xlink:to="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-74c8-bb79-5b38ebf8bc45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-74c8-bb79-5b38ebf8bc45_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-74c8-bb79-5b38ebf8bc45" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-74c8-bb79-5b38ebf8bc45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-7e98-b26d-4fd734ccfdc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cd372-5ee7-74c8-bb79-5b38ebf8bc45" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-7e98-b26d-4fd734ccfdc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_CreditAgreementMember_019cd372-5ee7-7beb-9f5c-728fbdaa2786" xlink:href="ecg-20260331.xsd#ecg_CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cd372-5ee7-7e98-b26d-4fd734ccfdc3" xlink:to="loc_ecg_CreditAgreementMember_019cd372-5ee7-7beb-9f5c-728fbdaa2786" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7668-afcf-a82200c0f336" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cd372-5ee7-797e-9155-40e46e296446" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7668-afcf-a82200c0f336" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7668-afcf-a82200c0f336_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7668-afcf-a82200c0f336" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7668-afcf-a82200c0f336_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7717-96d1-d3026dd48470" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cd372-5ee7-7668-afcf-a82200c0f336" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7717-96d1-d3026dd48470" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019cd372-5ee7-7639-84f3-57f1c1f6ca25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7717-96d1-d3026dd48470" xlink:to="loc_us-gaap_LineOfCreditMember_019cd372-5ee7-7639-84f3-57f1c1f6ca25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_019df5aa-3c2a-7b73-8519-7e06ab524468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cd372-5ee7-7717-96d1-d3026dd48470" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_019df5aa-3c2a-7b73-8519-7e06ab524468" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019cd372-5ee7-7df8-9e16-20b41a7ffca0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019cd372-5ee7-7df8-9e16-20b41a7ffca0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_019cd372-5ee7-7e02-b4ac-256c08abfcf8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_019cd372-5ee7-7e02-b4ac-256c08abfcf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_LossContingencyAfterInsuranceClaimReceivables_019cd372-5ee7-7ca2-a8c1-dafb90f254ac" xlink:href="ecg-20260331.xsd#ecg_LossContingencyAfterInsuranceClaimReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_ecg_LossContingencyAfterInsuranceClaimReceivables_019cd372-5ee7-7ca2-a8c1-dafb90f254ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedRemainderOfYear_019cd372-5ee7-71a8-acf7-67dc25890312" xlink:href="ecg-20260331.xsd#ecg_GuarantorFixedMaximumAmountsGuaranteedRemainderOfYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedRemainderOfYear_019cd372-5ee7-71a8-acf7-67dc25890312" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedYearOne_019cd372-5ee7-7c51-bd6d-0b6765fb53d3" xlink:href="ecg-20260331.xsd#ecg_GuarantorFixedMaximumAmountsGuaranteedYearOne"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedYearOne_019cd372-5ee7-7c51-bd6d-0b6765fb53d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedYearTwo_019cd372-5ee7-7424-90da-16d2dea7318d" xlink:href="ecg-20260331.xsd#ecg_GuarantorFixedMaximumAmountsGuaranteedYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedYearTwo_019cd372-5ee7-7424-90da-16d2dea7318d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedYearThree_019cd372-5ee7-71bf-afdd-7e71e39afea5" xlink:href="ecg-20260331.xsd#ecg_GuarantorFixedMaximumAmountsGuaranteedYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedYearThree_019cd372-5ee7-71bf-afdd-7e71e39afea5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedYearFour_019cd372-5ee7-76a8-9d85-222fda8b1c88" xlink:href="ecg-20260331.xsd#ecg_GuarantorFixedMaximumAmountsGuaranteedYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedYearFour_019cd372-5ee7-76a8-9d85-222fda8b1c88" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedAfterYearFour_019cd372-5ee7-7445-af18-79e3a4c9b03d" xlink:href="ecg-20260331.xsd#ecg_GuarantorFixedMaximumAmountsGuaranteedAfterYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_ecg_GuarantorFixedMaximumAmountsGuaranteedAfterYearFour_019cd372-5ee7-7445-af18-79e3a4c9b03d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_GuarantorObligationsOutstanding_019cd372-5ee7-7c65-bcfc-f432283db64a" xlink:href="ecg-20260331.xsd#ecg_GuarantorObligationsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_ecg_GuarantorObligationsOutstanding_019cd372-5ee7-7c65-bcfc-f432283db64a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019cd372-5ee7-7493-8374-96e2c3669e0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cd372-5ee7-73b4-8c2d-2d218b1da95a" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019cd372-5ee7-7493-8374-96e2c3669e0c" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019cd372-5ee7-7771-9e03-dbf936ed7e98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019cd372-5ee7-74fd-b38d-d1c28138fe6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019cd372-5ee7-7771-9e03-dbf936ed7e98" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019cd372-5ee7-74fd-b38d-d1c28138fe6c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019cd372-5ee7-75f6-b30a-4911212ef677" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019cd372-5ee7-74fd-b38d-d1c28138fe6c" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019cd372-5ee7-75f6-b30a-4911212ef677" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019cd372-5ee7-75f6-b30a-4911212ef677_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019cd372-5ee7-75f6-b30a-4911212ef677" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019cd372-5ee7-75f6-b30a-4911212ef677_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019cd372-5ee7-7d18-9bf7-06005fd1dc72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019cd372-5ee7-75f6-b30a-4911212ef677" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019cd372-5ee7-7d18-9bf7-06005fd1dc72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_TransitionServicesAgreementMember_019cd372-5ee7-78bb-bcca-b0e44bd0f557" xlink:href="ecg-20260331.xsd#ecg_TransitionServicesAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019cd372-5ee7-7d18-9bf7-06005fd1dc72" xlink:to="loc_ecg_TransitionServicesAgreementMember_019cd372-5ee7-78bb-bcca-b0e44bd0f557" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cd372-5ee7-7aac-811a-64a3e11301fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019cd372-5ee7-74fd-b38d-d1c28138fe6c" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cd372-5ee7-7aac-811a-64a3e11301fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019cd372-5ee7-7aac-811a-64a3e11301fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cd372-5ee7-7aac-811a-64a3e11301fb" xlink:to="loc_us-gaap_RelatedPartyDomain_019cd372-5ee7-7aac-811a-64a3e11301fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019cd372-5ee7-77de-be17-85430a31649e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cd372-5ee7-7aac-811a-64a3e11301fb" xlink:to="loc_us-gaap_RelatedPartyDomain_019cd372-5ee7-77de-be17-85430a31649e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019cd372-5ee7-7e17-be64-59d52d259fc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019cd372-5ee7-77de-be17-85430a31649e" xlink:to="loc_us-gaap_RelatedPartyMember_019cd372-5ee7-7e17-be64-59d52d259fc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019cd372-5ee7-75cf-abeb-3fa2d93c36cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019cd372-5ee7-7771-9e03-dbf936ed7e98" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019cd372-5ee7-75cf-abeb-3fa2d93c36cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_SeparationAgreementTransitionServicesAgreementRecurringExpenses_019cd372-5ee7-7e16-8b76-8a28168f0811" xlink:href="ecg-20260331.xsd#ecg_SeparationAgreementTransitionServicesAgreementRecurringExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019cd372-5ee7-7771-9e03-dbf936ed7e98" xlink:to="loc_ecg_SeparationAgreementTransitionServicesAgreementRecurringExpenses_019cd372-5ee7-7e16-8b76-8a28168f0811" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_SeparationAgreementTransitionServicesAgreementPeriod_019cd372-5ee7-78ba-b28d-3a9acd5be1c6" xlink:href="ecg-20260331.xsd#ecg_SeparationAgreementTransitionServicesAgreementPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019cd372-5ee7-7771-9e03-dbf936ed7e98" xlink:to="loc_ecg_SeparationAgreementTransitionServicesAgreementPeriod_019cd372-5ee7-78ba-b28d-3a9acd5be1c6" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.everus.com/role/SubsequentEventsNarrativeDetails" xlink:type="simple" xlink:href="ecg-20260331.xsd#SubsequentEventsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.everus.com/role/SubsequentEventsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019cd372-5ee7-78d3-93ed-ae1a0c813e2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019cd372-5ee7-759a-9fcd-0041f01da773" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cd372-5ee7-78d3-93ed-ae1a0c813e2c" xlink:to="loc_us-gaap_SubsequentEventTable_019cd372-5ee7-759a-9fcd-0041f01da773" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019cd372-5ee7-7a3f-9036-dcf5ec24f07b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019cd372-5ee7-759a-9fcd-0041f01da773" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019cd372-5ee7-7a3f-9036-dcf5ec24f07b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019cd372-5ee7-7a3f-9036-dcf5ec24f07b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019cd372-5ee7-7a3f-9036-dcf5ec24f07b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019cd372-5ee7-7a3f-9036-dcf5ec24f07b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019cd372-5ee7-7024-9aae-dce32d3ce62d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019cd372-5ee7-7a3f-9036-dcf5ec24f07b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019cd372-5ee7-7024-9aae-dce32d3ce62d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019cd372-5ee7-74d9-acb0-db8a0506be5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019cd372-5ee7-7024-9aae-dce32d3ce62d" xlink:to="loc_us-gaap_SubsequentEventMember_019cd372-5ee7-74d9-acb0-db8a0506be5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019dc111-7f81-7380-8886-968ef91366a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019cd372-5ee7-759a-9fcd-0041f01da773" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019dc111-7f81-7380-8886-968ef91366a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dc111-7f81-7380-8886-968ef91366a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dc111-7f81-7380-8886-968ef91366a1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dc111-7f81-7380-8886-968ef91366a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dc111-7f81-7068-a90e-30c79e5cb65b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019dc111-7f81-7380-8886-968ef91366a1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dc111-7f81-7068-a90e-30c79e5cb65b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_SEMMember_019dc111-e1dd-7077-9ecf-1a6860f779b9" xlink:href="ecg-20260331.xsd#ecg_SEMMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019dc111-7f81-7068-a90e-30c79e5cb65b" xlink:to="loc_ecg_SEMMember_019dc111-e1dd-7077-9ecf-1a6860f779b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019dc110-e0e7-78be-98aa-4d8f1d7ce6b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cd372-5ee7-78d3-93ed-ae1a0c813e2c" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019dc110-e0e7-78be-98aa-4d8f1d7ce6b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ecg_BusinessCombinationEarnoutPaymentPercentageOfPurchasePriceMaximum_019dc112-bbde-7fd5-8b4e-c3cb3714a34a" xlink:href="ecg-20260331.xsd#ecg_BusinessCombinationEarnoutPaymentPercentageOfPurchasePriceMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cd372-5ee7-78d3-93ed-ae1a0c813e2c" xlink:to="loc_ecg_BusinessCombinationEarnoutPaymentPercentageOfPurchasePriceMaximum_019dc112-bbde-7fd5-8b4e-c3cb3714a34a" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
