in·​val·​i·​date | \(ˌ)in-ˈva-lə-ˌdāt \
invalidated; invalidating; invalidates

Definition of invalidate 

transitive verb

: to make invalid especially : to weaken or destroy the cogency of

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Other Words from invalidate

invalidation \ (ˌ)in-​ˌva-​lə-​ˈdā-​shən \ noun
invalidator \ in-​ˈva-​lə-​ˌdā-​tər \ noun

Choose the Right Synonym for invalidate

nullify, negate, annul, abrogate, invalidate mean to deprive of effective or continued existence. nullify implies counteracting completely the force, effectiveness, or value of something. a penalty nullified the touchdown negate implies the destruction or canceling out of each of two things by the other. the arguments negate each other annul suggests making ineffective or nonexistent often by legal or official action. the treaty annuls all previous agreements abrogate is like annul but more definitely implies a legal or official act. a law to abrogate trading privileges invalidate implies making something powerless or unacceptable by declaration of its logical or moral or legal unsoundness. the court invalidated the statute

Examples of invalidate in a Sentence

actions that will invalidate the contract The study invalidates earlier theories. factors that may invalidate the test results
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Recent Examples on the Web

Again and again, they are told that vocal qualities and tics like higher pitch, upspeak, and vocal fry — which are usually associated with women — are worthy of condescension and invalidating to the speaker. Laura Hudson, The Verge, "Star Wars voice actress mocks Christine Blasey Ford’s voice during Kavanaugh testimony," 27 Sep. 2018 Sean Rayford/Getty Images States are kicking a growing number of voters off their rolls in the wake of a 2013 Supreme Court decision that invalidated a key part of the Voting Rights Act. Li Zhou, Vox, "The increase coincides with a Supreme Court decision on the Voting Rights Act, according to a new report.," 20 July 2018 In a response filed in June, political appointees in the department said eliminating the penalty should not invalidate the entire law. Julie Rovner, Washington Post, "Democrats Rally Against Threats To The ACA To Block Trump’s Supreme Court Nominee," 10 July 2018 Closer to home, the Supreme Court recently opened the door to legal sports betting across the invalidating federal prohibitions on such wagers. Gerrard Cowan, WSJ, "A Gambling ETF Bets on Global Growth," 8 July 2018 Stormy Daniels, whose real name is Stephanie Clifford, is suing to have the nondisclosure agreement invalidated. Bill Allison,, "Trump Campaign Raises $10.1 Million as Legal Matters Grow," 15 Apr. 2018 No such numbers were published for District 3, but Granma reported that turnout in Villa Clara province was 87.4 percent and that 6.19 percent of those who did vote invalidated their ballots or left them blank. Nora Gámez Torres, miamiherald, "Cuba’s Miguel Díaz-Canel is en route to the presidency with merely one percent of votes | Miami Herald," 21 Mar. 2018 But gun manufacturers have not sold any new models of semiautomatic handguns in California since then, and in 2014 a gun group sued to invalidate the law, saying its standards could never be met. Bob Egelko,, "Calif. Supreme Court upholds law requiring bullet-tracing technology on guns," 28 June 2018 Hontiveros cited Duterte’s refusal to demand immediate Chinese compliance with a 2016 arbitration ruling that invalidated China’s vast claims to the South China Sea and upheld the Philippines’ sovereign rights to vast stretches of waters. Washington Post, "Protesters heckle, disrupt Duterte’s Independence Day speech," 12 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'invalidate.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of invalidate

1649, in the meaning defined above

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Last Updated

17 Nov 2018

Look-up Popularity

Time Traveler for invalidate

The first known use of invalidate was in 1649

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More Definitions for invalidate



English Language Learners Definition of invalidate

: to weaken or destroy the effect of (something)

: to show or prove (something) to be false or incorrect


in·​val·​i·​date | \in-ˈva-lə-ˌdāt \
invalidated; invalidating

Kids Definition of invalidate

: to weaken or destroy the effect of The phony signature invalidated the contract.


transitive verb
in·​val·​i·​date | \in-ˈva-lə-ˌdāt \

Legal Definition of invalidate 

: to make or declare invalid

Other Words from invalidate

invalidation \ in-​ˌva-​lə-​ˈdā-​shən \ noun

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