v.tr. (also absol.) 1 compose or perform (music, verse, etc.) extempore. 2 provide or construct (a thing) extempore. improvisation n. improvisational adj. improvisatorial adj. improvisatory adj. improviser n.
[ F improviser or It. improvvisare f. improvviso extempore, f. L improvisus past part. (as IN-(1), PROVIDE) ]