verb (used with object), ad-libbed, ad-lib·bing.

  1. to improvise all or part of (a speech, a piece of music, etc.): to ad-lib one’s lines.

verb (used without object), ad-libbed, ad-lib·bing.

  1. to act, speak, etc., without preparation: Throughout the play he had to ad-lib constantly.


  1. impromptu; extemporaneous: ad-lib remarks to hecklers.

verb -libs, -libbing or -libbed

  1. to improvise and deliver without preparation (a speech, musical performance, etc)

adjective (ad lib when predicative)

  1. improvised; impromptu

adverb ad lib

  1. without restraint; freely
  2. music short for ad libitum


  1. an improvised performance, often humorous
53 queries 0.664