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Definition of extemporaneous:

  1. Composed, performed, or uttered on the spur of the moment, or without previous study; unpremeditated; off- hand; extempore; extemporary; as, an extemporaneous address or production.


prepared, without preparation, by ear, spur-of-the-moment, on the spot, offhand, off-the-cuff, ad hoc, offhanded, unwritten, ad-libbed, extemporary, unprepared, ad-lib, on impulse, spur-of-the-moment, unstudied, extempore, informal, snap, unrehearsed.

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