Whats a short definintion for Improvisation?

Question: Whats a short definintion for Improvisation!?

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Making up something on the spot, with no use of reference or help from anyone else!

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the ability, as an ensemble, to come up with a completely original situation, dialogue, or set of movements without preparation!. Oftentimes, based on suggestions given to them by an audience!.Www@QuestionHome@Com

Coming up with thing on the spot!.Www@QuestionHome@Com