from
The Collaborative International Dictionary of English v.0.48
Improvise \Im`pro*vise"\, v. t. [imp. & p. p. {Improvised}; p.
pr. & vb. n. {Improvising}.] [F. improviser, it.
improvvisare, fr. improvviso unprovided, sudden, extempore,
L. improvisus; pref. im- not + provisus foreseen, provided.
See {Proviso}.]
1. To compose, recite, or sing extemporaneously, especially
in verse; to extemporize; also, to play upon an
instrument, or to act, extemporaneously.
[1913 Webster]
2. To bring about, arrange, do, or make, immediately or on
short notice, without previous preparation and with no
known precedent as a guide.
[1913 Webster +PJC]
Charles attempted to improvise a peace. --Motley.
[1913 Webster]
3. To invent, or provide, offhand, or on the spur of the
moment; as, he improvised a hammer out of a stone.
[1913 Webster]