Definition of improvisate in English:

improvisate

Pronunciation /ˈɪmprəvʌɪzeɪt/ /(ˌ)ɪmˈprɒvɪzeɪt/

verb

rare
  • To compose or perform (poetry, drama, music, etc.) spontaneously; to extemporize (a speech, lecture, etc.).

Origin

Early 19th century. From French improviser and its etymon Italian improvvisare + -ate, after improvisation, improvisator, etc.