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The Collaborative International Dictionary
Improvisate

Improvisate \Im*prov"i*sate\, a. [See Improvise.] Unpremeditated; impromptu; extempore. [R.]

Improvisate

Improvisate \Im*prov"i*sate\, v. t. & i. [imp. & p. p. Improvisated; p. pr. & vb. n. Improvisating.] To improvise; to extemporize.

Wiktionary
improvisate
  1. unpremeditated; impromptu v

  2. To improvise; to extemporize.