- improvisation - a creation spoken or written or composed extemporaneously (without prior preparation)
--1 is a kind of creation
Derived form: verb improvise1 - improvisation, temporary expedient - an unplanned expedient
--2 is a kind of expedient
Derived forms: verb improvise2, verb improvise1 - extemporization, extemporisation, improvisation - a performance given extempore without planning or preparation
--3 is a kind of performance
Derived form: verb improvise1