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.

1650–60; < Late Latin extemporāneus on the spur of the moment. See extempore, -an, -eous

extemporaneously, adverb
extemporaneousness, extemporaneity [ik-stem-puh-ruh-nee-i-tee] , noun

1, 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. memorized.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To extemporaneous
World English Dictionary
extemporaneous or extemporary (ɪkˌstɛmpəˈreɪnɪəs, ɪkˈstɛmpərərɪ, -prərɪ)
1.  spoken, performed, etc, without planning or preparation; impromptu; extempore
2.  done in a temporary manner; improvised
extemporary or extemporary
extempo'raneously or extemporary
ex'temporarily or extemporary
extempo'raneousness or extemporary
ex'temporariness or extemporary

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

1650s (earlier extemporal, 1560s), from L.L. extemporaneus, from L. ex tempore (see extempore). Related: Extemporaneously.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
The old man was then in his 90's, yet he provided detailed extemporaneous
  narration of 30 years of celluloid family history.
The conventions are only weeks away now and some delegates already have their
  extemporaneous, speeches memorized.
What would be unreasonable would be to expect someone to be perfect in an
  extemporaneous situation such as the classroom.
You are talking about a low-fidelity, decades-old recording of an
  extemporaneous conversation.
Related Words
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature