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Definition of impromptu:

  1. A piece composed or played at first thought; a composition in the style of an extempore piece.
  2. Offhand; without previous study; extemporaneous; extempore; as, an impromptu verse.
  3. Something made or done offhand, at the moment, or without previous study; an extemporaneous composition, address, or remark.


extempore, prepared, offhanded, spontaneously, unwritten, ad libitum, snap, spur-of-the-moment, ad-lib, unprepared, extemporary, off-the-cuff, offhand.

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