verb (used with object), ad-libbed, ad-lib·bing.
- 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.
- to act, speak, etc., without preparation: Throughout the play he had to ad-lib constantly.
- impromptu; extemporaneous: ad-lib remarks to hecklers.
verb -libs, -libbing or -libbed
- to improvise and deliver without preparation (a speech, musical performance, etc)
adjective (ad lib when predicative)
- improvised; impromptu
adverb ad lib
- without restraint; freely
- music short for ad libitum
- an improvised performance, often humorous