/ Dictionary / Index D defiant: Meaning and Definition of Find definitions for: de•fi•ant Pronunciation: (di-fī'unt), [key] — adj. characterized by defiance; boldly resistant or challenging: a defiant attitude. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: defiant (Thesaurus) defiance defiber Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language