/ Dictionary / Index D defamation: Meaning and Definition of Find definitions for: def•a•ma•tion Pronunciation: (def"u-mā'shun), [key] — n. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: defamation (Thesaurus) defalcation defamatory Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language