ad-lib - definition and synonyms

noun [countable] 

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/ˌæd ˈlɪb/
singularad-lib
pluralad-libs
  1. something you say in a speech, play etc without preparing or writing it before you say it

    one of his brilliant ad-libs

derived word

ad-lib

 

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adjective, adverb

She can talk ad-lib on just about any subject.