American English

Definition of improvise verb from the Oxford Advanced American Dictionary

     

    improvise

     verb
    verb
    NAmE//ˈɪmprəˌvaɪz//
     
    Verb Forms present simple I / you / we / they improvise
     
    he / she / it improvises
     
    past simple improvised
     
    -ing form improvising
     
     
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  1. 1 [intransitive, transitive] to make or do something using whatever is available, usually because you do not have what you really need There isn't much equipment. We're going to have to improvise. improvise something We improvised some shelves out of a few boards and bricks.
  2. 2 [intransitive, transitive] to invent music, the words in a play, a statement, etc. while you are playing or speaking, instead of planning it in advance “It'll be ready some time next week, I imagine,” she said, improvising. improvise on something He improvised on the melody. improvise something I had to improvise an introductory speech.
improvisation
 
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NAmE//ɪmˌprɑvəˈzeɪʃn//
 
noun [uncountable, countable]
 
adjective an improvised shelter/speech
See the Oxford Advanced Learner's Dictionary entry: improvise