You searched for: “ad libitum
ad libitum; ad lib; (adverb)
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 noun, an ad lib is an "off-the-cuff", or unprepared, remark.

It is said that there are some politicians who have "carefully planned ad libs".

This entry is located in the following units: ad- (page 3) Latin Proverbs, Mottoes, Phrases, and Words: Group A (page 9)
Word Entries at Get Words: “ad libitum
ad lib., ad libitum
at will

Literally meaning is "at pleasure". This expression is popularly used as a noun phrase or modifier in English in the form "ad lib" to express absence of planning; for example, "His worst jokes were carefully planned ad libs."

This entry is located in the following unit: Abbreviations Frequently Encountered (page 1)