15 letters · 26 points in Scrabble
noun a performance given extempore without planning or preparation
originEtymology tree English extemporise Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin -ātiōlbor. Old French -ationbor. Middle English -acioun English -ation English extemporisation From extemporise + -ation.
Etymology from Wiktionary, CC BY-SA 3.0