ad lib.

ad libitum; ad lib. At pleasure; according to one's pleasure; freely, unscripted, improvised; extemporaneously. This is usually shortened to ad lib. [with or without a period]. Ad lib is used both as a verb and as a noun. When used in the entertainment world, to ad lib means to improvise, to add an impromptu word or statement to a script. As a n...
Found on http://www.wordinfo.info/words/index/info/view_unit/3055/9
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