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defamation

American  
[def-uh-mey-shuhn] / ˌdɛf əˈmeɪ ʃən /

noun

  1. the act of defaming; false or unjustified injury of the good reputation of another, as by slander or libel; calumny.

    She sued the magazine for defamation of character.


defamation British  
/ ˌdɛfəˈmeɪʃən /

noun

  1. law the injuring of a person's good name or reputation Compare libel slander

  2. the act of defaming or state of being defamed

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Commonly Confused

See slander.

Etymology

Origin of defamation

First recorded in 1275–1325; Middle English; replacing (by analogy with defame ) Middle English diffamacioun, from Medieval Latin diffāmātiōn- (stem of diffāmātiō ), equivalent to Latin diffāmāt(us) (past participle of diffāmāre; defame ) + -iōn- noun suffix ( see -ion)

Explanation

Defamation is a dirty trick against someone's reputation. If you were so furious at your friend that you spread a rumor that he was still wetting his bed, that would be defamation of your friend. The noun defamation describes something very mean and completely deliberate, essentially a false accusation against someone or an attack on a person's good reputation. The terms libel and slander — written or spoken lies about a person, group, or business — both fall under the category of defamation. Sometimes defamation is even a punishable crime, and in every instance it's unkind and malicious.

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Vocabulary lists containing defamation

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The case type is described as "Media and Communication -- Part 7 Claim -- Defamation -- libel and slander".

From Barron's • Apr. 10, 2026

Defamation, fraud, false light and forgery laws already address the potential of deceptive expression to cause real harm.

From Los Angeles Times • Dec. 22, 2024

Defamation cases in Australia have a lower standard of proof than criminal cases and judges often allow reams of seemingly tangential evidence to help them make judgements on the credibility or character of witnesses.

From BBC • Apr. 4, 2024

Defamation law, too, can be used as a defense in cases where one’s identity has been used inappropriately, or some types of misinformation.

From Slate • Dec. 28, 2023

But pray, Gentlemen, said I, if, as you seem to believe, his Defamation has more of Malice than Truth in it, does he not blacken himself by it?

From A Letter from Mr. Cibber to Mr. Pope by Cibber, Colley

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