/ Dictionary / Index I improvisation: Meaning and Definition of Find definitions for: im•prov•i•sa•tion Pronunciation: (im-prov"u-zā'shun, im"pru-vu-), [key] — n. an act of improvising. something improvised. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: improvisation (Thesaurus) improvident improvisator 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