Dictionaryad libPronunciation: (ad lib', ad'), [key] 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-libPronunciation: (ad lib', ad'-), [key] —v., -libbed, -lib•bing, —adj. —v.t. to improvise all or part of (a speech, a piece of music, etc.): to ad-lib one's lines. —v.i. to act, speak, etc., without preparation: Throughout the play he had to ad-lib constantly. —adj. impromptu; extemporaneous: ad-lib remarks to hecklers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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