impromptu a (h) n-PROM-too Your browser does not support the audio element. [ French ] Definition A single-movement, piano composition of the Romantic era, usually short, that has a spontaneous character. The term implies a freedom of style and a casual nature. Share Share on Facebook (opens in a new tab) Share on X (opens in a new tab) Last Updated: 2016-05-20 14:46:30