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“defamation” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

defamation
calumnia (false accusation): criminatio (slander; the blackening of a man’s character): obtrectatio (malicious disparaging; often in plur.).

Quick answer

What is the Latin word for defamation?
The usual Latin words for “defamation” are calumnia, crīminātiō, obtrectātiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.