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