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English definition of “improvisation”

improvisation

noun [C/U] /ɪmˌprɑv·əˈzeɪ·ʃən, ˌɪm·prə·və-/
music a performance that is not practiced and that is invented by the performers Improvisation is also the activity of making or doing something that you have not planned, using whatever you find.
(Definition of improvisation from the Cambridge Academic Content Dictionary © Cambridge University Press)
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