/ Dictionary / Index I impf.: Meaning and Definition of Find definitions for: impf. Pronunciation: [key] imperfect. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. impetus imp. gal. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language