You searched for: “ad lib”
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)
ad-lib (verb), ad-libs; ad-libbed; ad-libbing
To improvise all or part of a speech or another kind of performance; that is, to spontaneously say something without prior preparation: Many in the audience noticed that the mistress of ceremonies was ad-libbing her speech at the awards ceremony.
To improvise words, gestures, etc. that are not in a script.
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This entry is located in the following unit: English Words in Action, Group A (page 3)
ad-lib, ad-libs; ad-libbed; ad-libbing
To spontaneously say something without prior preparation. (1)
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