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 invalidation (audio) \ noun
invalidator \ in-​ˈva-​lə-​ˌdā-​tər How to pronounce invalidator (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 In a victory for supporters of LGBTQ rights, three Christian conservative organizations have failed in their legal fight to invalidate local ordinances in Indianapolis, Carmel, Bloomington and Columbus that provide specific LGBTQ protections. Crystal Hill, Indianapolis Star, "Judge rules against conservative groups in challenge of RFRA nondiscrimination 'fix'," 26 Nov. 2019 Pittsburgh tried enforcing an assault-weapons ban in 1993, but the state Legislature quickly took action to invalidate the measure, and the Pennsylvania Supreme Court ruled that city officials had overstepped. Washington Post, "Judge tosses Pittsburgh gun laws passed after massacre," 29 Oct. 2019 The questionable slogan, Earle said, references more obscure efforts in the town to invalidate the 1857 document that championed slavery. Max Cohen, USA Today, "Slavery in America: Some historical sites try to show the horrors. Others are far behind.," 17 Oct. 2019 The law amends the 2017 Child Hunger Prevention and Fair Treatment Act by requiring schools to invalidate policies that ask officials to give alternative meals to students who have unpaid fees, according to Newsom. Fox News, "California bills seeks to ban 'lunch shaming,' will guarantee state-funded meals for students," 14 Oct. 2019 Critics of the litigation, which include the Alabama District Attorneys Association, believe that such cases are part of a strategy to persuade a federal judge to invalidate Alabama law. John Sharp |, al, "Alabama civil asset forfeiture faces constitutional challenges as lawmakers ponder reform," 7 Oct. 2019 Last November, a Dutch court invalidated a European patent for teff flour, a staple grain that’s used in Ethiopia’s injera bread. Brian Browdie, Quartz Africa, "South Africa’s Khoisan community will finally get a share of the commercialization of rooibos," 5 Nov. 2019 The court has struck down advertising rules in the pharmaceutical market, invalidated state limits on the sale of medical information, and overruled mandatory employee fees to fund the unions that represent public employees in collective bargaining. John Fabian Witt, The New Republic, "The Shrinking Legacy of a Supreme Court Justice," 1 Oct. 2019 Tops on the list in this week’s episode is the Ohio Supreme Court dealing a fatal blow to Cleveland’s Fannie Lewis law, which the city saw as an effective tool to fight poverty, but state lawmakers sought to invalidate. Jeremy Pelzer, cleveland, "Is Jim Renacci gearing up to run for Ohio governor again? Capitol Letter," 27 Sep. 2019

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

1 Dec 2019

Cite this Entry

“Invalidate.” The Dictionary, Merriam-Webster Inc., Accessed 9 December 2019.

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More Definitions for invalidate


How to pronounce invalidate (audio)

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 invalidation (audio) \ noun

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