WordReference Random House Learner's Dictionary of American English © 2017
ex•tem•po•ra•ne•ous /ɪkˌstɛmpəˈreɪniəs/USA pronunciation   adj. 
  1. spoken or performed without preparation;
    impromptu: an extemporaneous speech.
ex•tem•po•ra•ne•ous•ly, adv. See -temp-.

WordReference Random House Unabridged Dictionary of American English © 2017
ex•tem•po•ra•ne•ous  (ik stem′pə rānē əs),USA pronunciation adj. 
  1. done, spoken, performed, etc., without special advance preparation; impromptu:an extemporaneous speech.
  2. previously planned but delivered with the help of few or no notes:extemporaneous lectures.
  3. speaking or performing with little or no advance preparation:extemporaneous actors.
  4. made for the occasion, as a shelter.
ex•tem′po•rane•ous•ly, adv. 
ex•tem′po•rane•ous•ness, ex•tem•po•ra•ne•i•ty  (ik stem′pə rə nēi tē),USA pronunciation n. 
  • Late Latin extemporāneus on the spur of the moment. See extempore, -an, -eous
  • 1650–60
    • 1.See corresponding entry in Unabridged 2.
      Extemporaneous (
      impromptu, improvised are used of expression given without preparation or only partial preparation.
      Extemporaneous and
      impromptu may both refer to speeches given without any preparation:an extemporaneous(impromptu) speech. Extemporaneous may also refer to a speech given from notes or an outline:extemporaneous lectures.Impromptu also refers to poems, songs, etc., delivered without preparation and at a moment's notice.
      Improvised is applied to something composed (recited, sung, acted), at least in part, as one goes along:an improvised piano accompaniment.
    • 1.See corresponding entry in Unabridged memorized.

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