Etymology
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improvisation (n.)

"act of improvising musically," 1786, from French improvisation, from improviser "compose or say extemporaneously" (17c.), from Italian improvisare "to sing or speak extempore," from Latin improviso "unforeseen; not studied or prepared beforehand," ablative of improvisus "not foreseen, unexpected," from assimilated form of in- "not, opposite of" (see in- (1)) + provisus "foreseen," also "provided," past participle of providere "foresee, provide" (see provide). From music the sense expanded to a general meaning "do or perform on the spur of the moment."

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Definitions of improvisation

improvisation (n.)
a creation spoken or written or composed extemporaneously (without prior preparation);
improvisation (n.)
an unplanned expedient;
Synonyms: temporary expedient
improvisation (n.)
a performance given extempore without planning or preparation;
Synonyms: extemporization / extemporisation
From wordnet.princeton.edu