/ Dictionary / Index D D/F: Meaning and Definition of Find definitions for: D/F Pronunciation: [key] direction finding. D.F. Pronunciation: [key] Defender of the Faith. Distrito Federal. Doctor of Forestry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dezincification D.F.A. Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language