improvisation

[im-prov-uh-zey-shuhn, im-pruh-vuh-]
noun
1.
an act of improvising.
2.
something improvised.

Origin:
1780–90; improvise + -ation

improvisational, adjective
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World English Dictionary
improvisation (ˌɪmprəvaɪˈzeɪʃən)
 
n
1.  the act or an instance of improvising
2.  a product of improvising; something improvised
 
improvisational
 
adj
 
improvisatory
 
adj

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Etymonline
Word Origin & History

improvisation
1786, "act of improvising musically," from Fr. improvisation, from improviser "compose or say extemporaneously," from It. improvvisare, from improvviso "unforeseen, unprepared," from L. improvisus, from in- "not" + provisus "foreseen," also "provided," pp. of providere "foresee, provide" (see
Online Etymology Dictionary, © 2010 Douglas Harper
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Synonyms
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