Something improvised, especially a musical passage or a dramatic skit.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "improvisation" in a sentence
"EK: Well, I think that, for me, I have a lot of issues with the term "improvisation.""
"Sometimes of an evening he would perform upon the piano, indulging in a series of broken chords which he called improvisation, and upon these occasions he felt that he was a kind and thoughtful master when he set the drawing-room door open so that the servants might hear; and as his servants thought so too it was all eminently satisfactory."
"But I had always been interested in improvisation, even back when I went to music school at Indiana University."