/ Dictionary / Index I iffen: Meaning and Definition of Find definitions for: if•fen Pronunciation: (if'un), [key] — conj. Dial. if. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. IFF iffy Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language