in·​val·​i·​date | \ (ˌ)in-ˈva-lə-ˌdāt How to pronounce invalidate (audio) \
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 How to pronounce invalidate (audio) \ noun
invalidator \ in-​ˈva-​lə-​ˌdā-​tər How to pronounce invalidate (audio) \ 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 One of the most important elements of continual implementation is to validate the assumptions made in articulating your strategy and quickly validate or invalidate them to adjust the plan along the way. Isabelle Perreault, Forbes, 7 June 2021 Following Calabrese’s March ruling, the landlords who filed suit asked the judge to clarify that earlier ruling and to essentially invalidate the moratorium nationwide. Eric Heisig, cleveland, 3 June 2021 The result could make Medina Spirit the second horse in the competition's history to be disqualified for drug violations and may invalidate its victory. Tori B. Powell, CBS News, 2 June 2021 Judge Joseph Van Bokkelen denied Shelton’s request for a mistrial in June, saying her argument that an FBI informant illegally gained access to documents in her office did not invalidate the charge. Alexandra Kukulka,, 19 May 2021 The three available vaccines in the US -- Johnson & Johnson, Pfizer/BioNTech and Moderna -- are halal and will not invalidate a fast, the organizations said in a joint news release. Zamira Rahim, CNN, 13 Apr. 2021 Council members also believed the Texas Legislature would invalidate the law when lawmakers convened in 2019. Joshua Fechter, San Antonio Express-News, 10 Mar. 2021 The extraordinary and ultimately unsuccessful lawsuit from Texas' Republican attorney general asked the Supreme Court to invalidate the results of the election in Wisconsin, Michigan, Pennsylvania and Georgia, all of which were won by Joe Biden. Daniel Dale, CNN, 17 May 2021 Reyes also signed on to a multistate lawsuit led by Texas to invalidate election results in four states carried by Biden during the election. Bryan Schott, The Salt Lake Tribune, 9 Mar. 2021

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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Time Traveler for invalidate

Time Traveler

The first known use of invalidate was in 1649

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Statistics for invalidate

Last Updated

12 Jun 2021

Cite this Entry

“Invalidate.” Dictionary, Merriam-Webster, Accessed 21 Jun. 2021.

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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 How to pronounce invalidate (audio) \
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 How to pronounce invalidate (audio) \

Legal Definition of invalidate

: to make or declare invalid

Other Words from invalidate

invalidation \ in-​ˌva-​lə-​ˈdā-​shən How to pronounce invalidate (audio) \ noun


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