WordReference Random House Learner's Dictionary of American English © 2017
- spoken or performed without preparation;
impromptu: an extemporaneous speech.
- done, spoken, performed, etc., without special advance preparation; impromptu:an extemporaneous speech.
- previously planned but delivered with the help of few or no notes:extemporaneous lectures.
- speaking or performing with little or no advance preparation:extemporaneous actors.
- made for the occasion, as a shelter.
- Late Latin extemporāneus on the spur of the moment. See extempore, -an, -eous
- 1.See corresponding entry in Unabridged 2. Extemporaneous (extempore), 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.