Definition of defamation noun from the Oxford Advanced American Dictionary

 

defamation

 noun
noun
NAmE//ˌdɛfəˈmeɪʃn//
 
[uncountable, countable](formal)
 
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the act of damaging someone's reputation by saying or writing bad or false things about them The company sued for defamation. He brought a legal action against the magazine for defamation of character.
See the Oxford Advanced Learner's Dictionary entry: defamation