/ Dictionary / Index D defier: Meaning and Definition of Find definitions for: de•fi•er Pronunciation: (di-fī'ur), [key] — n. a person who defies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. de fide* defilade Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language