Origin: 1820–30; < French improviser, or its source, Italian improvisare (later improvvisare), verbal derivative of improviso improvised < Latin imprōvīsus, equivalent to im-im-2 + prōvīsus past participle of prōvidēre to see beforehand, prepare, provide for (a future circumstance). See proviso
1826, from Fr. improviser (17c.), from It. improvisare "to sing or speak extempore," from improviso, from L. improvisus "unforeseen, unexpected" (see improvisation).