Repudiation means the act of claiming that something is invalid. If there were a repudiation of all the math test scores because of widespread cheating, you'd probably have to take the test again.

Repudiation comes from the verb "repudiate," which is rooted in the Latin word repudiare, meaning to divorce or reject. If you show something is false, you have made a repudiation of that thing. Until the repudiation of the claims, people thought that heroin was a harmless ingredient that could help ease a cough. General belief in the safety of cocaine and cigarettes had similar repudiations.

Definitions of repudiation

n rejecting or disowning or disclaiming as invalid

“Congressional repudiation of the treaty that the President had negotiated”
(law) a voluntary repudiation of a person's legal claim to something
disowning, disownment
refusal to acknowledge as one's own
Type of:
the speech act of rejecting

n refusal to acknowledge or pay a debt or honor a contract (especially by public authorities)

“the repudiation of the debt by the city”
Type of:
the act of refusing

n the exposure of falseness or pretensions

Type of:
presentation to view in an open or public manner

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