Breadcrumb Home > 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: dishabille Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language