invalidate

verb

in·​val·​i·​date (ˌ)in-ˈva-lə-ˌdāt 

invalidated; invalidating; invalidates

transitive verb

: to make invalid

especially : to weaken or destroy the cogency of

invalidation

(ˌ)in-ˌva-lə-ˈdā-shən 

noun

invalidator

in-ˈva-lə-ˌdā-tər 

noun

Synonyms

• abolish
• repeal
• cancel
• overturn
• nullify
• avoid

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

Recent Examples on the Web

The three-judge panel decision, in favor of plaintiff Save Our Access, directed the trial court to issue a writ of mandate, which would invalidate the 2022 ballot measure and restore the 30-foot height limit in the Midway District. —Jennifer Van Grove, San Diego Union-Tribune, 21 Oct. 2025

Smart & Safe Florida, a political committee trying to again put a recreational marijuana constitutional amendment on the ballot, filed a lawsuit against Secretary of State Cord Byrd last week, accusing him of trying to invalidate about 200,000 petitions without any basis in law. —Romy Ellenbogen, Miami Herald, 20 Oct. 2025

Democratic voting rights group estimate that gutting the Voting Rights Act’s protections against vote dilution could help Republicans win an additional 27 House seats − including 19 that would directly result from invalidating the law’s protections. —Maureen Groppe, USA Today, 15 Oct. 2025

Trump issued a version of it at the end of his first term but it was invalidated by the Biden administration almost immediately. —Kaitlyn Tiffany, The Atlantic, 9 Oct. 2025

Word History

First Known Use

1649, in the meaning defined above

Rhymes for invalidate

• abbreviate
• accelerate
• accommodate
• accumulate
• acuminate
• adjudicate
• adulterate
• affiliate
• agglomerate
• agglutinate
• alleviate
• amalgamate

Kids Definition

invalidate

verb

in·​val·​i·​date (ˈ)in-ˈval-ə-ˌdāt 

: to weaken or destroy the effect of

evidence invalidating their claim

invalidation

(ˌ)in-ˌval-ə-ˈdā-shən 

noun

Legal Definition

invalidate

transitive verb

in·​val·​i·​date in-ˈva-lə-ˌdāt 

: to make or declare invalid

invalidation

in-ˌva-lə-ˈdā-shən 

noun