/ Dictionary / Index I improv: Meaning and Definition of Find definitions for: im•prov Pronunciation: (im'prov), [key] — n. Informal. improvisation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. impropriety improve Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language