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 But once again, the U.S. Supreme Court invoked the 14th Amendment to invalidate it, and in 1974, a different California electorate repealed it. Los Angeles Times, "Behind the new show ‘Them’ is the ugly and true history of L.A.'s racist housing covenants," 27 Apr. 2021 Trump’s efforts to invalidate the victory of President-elect Joe Biden and cast his own vote in the presidential contest for the late Ronald Reagan. Washington Post, "Hogan to serve as co-chairman of No Labels, a national bipartisan organization," 15 Dec. 2020 There is, of course, no evidence to date to substantiate these widespread claims of voter fraud, with even establishment Republicans beginning to turn their backs on the Trump administration’s efforts to invalidate the election. Asia Ewart,, "Reminder: Trump Once Accused A Thanksgiving Turkey Of Refusing To Concede," 23 Nov. 2020 In an effort to invalidate the ballots of an overwhelming 74% of Mississippi voters, the AMA filed an amicus brief with the Mississippi Supreme Court in January to overturn the state's wildly popular medical cannabis ballot initiative. David L. Nathan, H. Westley Clark, CNN, "Under fire on race, the AMA should drop its support for the war on drugs," 14 Apr. 2021 Davis and Miller-Meeks were among the minority of House Republicans who voted against Trump’s groundless effort to invalidate Electoral College votes won by now- President Joe Biden. Alan Fram And Ryan J. Foley,, "Capitol riot clouds Democrats’ look at contested Iowa race," 24 Mar. 2021 More Hice also backed a long-shot lawsuit filed by Texas with the Supreme Court that sought to invalidate election results in four battleground states, including Georgia. Melissa Quinn, CBS News, "Trump backs GOP challenger to Georgia Secretary of State Brad Raffensperger," 22 Mar. 2021 The lawsuit, Wisconsin Voters Alliance v. Pence, sought to invalidate the results in Wisconsin, Pennsylvania, Georgia, Michigan, and Arizona, all of which President Biden won. Mike Brest, Washington Examiner, "Lawyer who filed lawsuit over election results referred for possible discipline," 20 Feb. 2021 In December, Biggs, along with more than 100 other GOP colleagues, signed onto a legal brief supporting a lawsuit brought by the attorney general of Texas asking the Supreme Court to invalidate the election results in four states. Ronald J. Hansen, The Arizona Republic, "Andy Biggs, under scrutiny after Jan. 6 riot, has long history on conservatism's fringes," 19 Feb. 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

7 May 2021

Cite this Entry

“Invalidate.” Dictionary, Merriam-Webster, Accessed 18 May. 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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