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

• abate
• abolish
• abrogate
• annul
• avoid
• cancel
• disannul
• dissolve
• negate
• null
• nullify
• quash
• repeal
• rescind
• roll back
• strike down
• vacate
• void

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 minute California becomes a regional market, FERC has jurisdiction to invalidate our laws and any player in the regional market, including coal plant owners, can challenge our environmental laws. —Jamie Court, Mercury News, 19 Apr. 2025

Pincus filed a brief on behalf of the American Public Health Association, which argued that invalidating the mandate could increase the cost of preventive care and the cost of health care overall, as patients would delay treatment for preventable diseases and emergencies. —Joseph Choi, The Hill, 18 Apr. 2025

O'Connor invalidated all of the task force’s recommendations since the Affordable Care Act was passed in March 2010, returning the power to insurers and employers to decide which, if any, preventive care would remain free to their patients. —Paul Shafer, The Conversation, 15 Apr. 2025

This would essentially invalidate their Social Security number and access to government benefits. —Aaron Navarro, CBS News, 10 Apr. 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