Im*promp"tu (?), adv. ∨ a. [F. impromptu, fr. L. in promptu in readiness, at hand; in in + promptus visibility, readiness, from promptus visible, ready. See Prompt.]
Offhand; without previous study; extemporaneous; extempore; as, an impromptu verse.
© Webster 1913.
Im*promp"tu, n.
1.
Something made or done offhand, at the moment, or without previous study; an extemporaneous composition, address, or remark.
2. Mus.
A piece composed or played at first thought; a composition in the style of an extempore piece.
© Webster 1913.