One who improvises.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


a person who improvises
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɪmˈprɒv əˌzeɪ tər, ˈɪm prə və-)

a person who improvises.
[1785–95; compare Italian improvvisatore]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Bocharov solicited this brief memoir from Mirkina when she was already advanced in years, and he corroborates Mirkina's impression of Bakhtin as a highly formal lecturer, 'a born orator with an expressive, beautiful timbre', a 'brilliant improvisator'.
This Indian gadfly jumps through all the hoops, sonnet, to villanelle, to heroic couplet, all tongue-in-cheeky." To Lincoln, Alexie is "A stand-up comedian, the Indian improvisator [who himself] is the performing text" (267).
More charming is Toback's first film starring Robert Downey, Jr., The Pick- Up Artist (1987), which has the definite advantage of being about an improvisator, so as to create a light-touch fusion between form and content.
French poet of the Parnassian school, known for his poems of satirical comment and for his peripatetic life as a strolling actor and improvisator.