/ Thesaurus / E Synonyms of extemporisation Find synonyms for: Noun1. extemporization, extemporisation, improvisation, performanceusage: a performance given extempore without planning or preparationWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language