- something improvised in speech, music, etc.: Was that joke part of your speech or an ad lib?
- at one's pleasure; without restriction.
- freely; as needed; without stint: Water can be given to the patients ad lib.
- to improvise all or part of (a speech, a piece of music, etc.): to ad-lib one's lines.
- to act, speak, etc., without preparation: Throughout the play he had to ad-lib constantly.
- impromptu; extemporaneous: ad-lib remarks to hecklers.
- to improvise and deliver without preparation (a speech, musical performance, etc)
- improvised; impromptu
- without restraint; freely
- music short for ad libitum
- an improvised performance, often humorous
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