ad lib: Meaning and Definition of

ad lib

1. something improvised in speech, music, etc.: Was that joke part of your speech or an ad lib?
2. at one's pleasure; without restriction.
3. freely; as needed; without stint: Water can be given to the patients ad lib.

ad-lib

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

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

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

ad lib.

1. See