improvisation - definition and synonyms

noun 

Your browser doesn’t support HTML5 audio

/ˌɪmprəvaɪˈzeɪʃ(ə)n/
singularimprovisation
pluralimprovisations
  1. 1
    [countable/uncountable] a performance of a play or a piece of music in which the performer invents words or musical notes that they have not learned or prepared before
  2. 2
    [uncountable] things that you do or make using only what is available at the time, instead of what is most suitable