Dictionary![]() ![]() ad lib•i•tumPronunciation: (ad lib'i-tum; Lat. äd lib'i-toom"), [key] 1. at one's pleasure. 2. Music.not obligatory or indispensable. Abbr.: ad lib. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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