Meaning of “ad lib” in the English Dictionary

"ad-lib" in American English

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ad-libverb [ I/T ]

us /ˈædˈlɪb/ -bb-

to do something without preparation or planning:

[ I ] She had lost her notes, so she ad-libbed for ten minutes.
adjective, adverb us /ˈædˈlɪb/

I did not want to give an ad-lib speech.

(Definition of “ad-lib” from the Cambridge Academic Content Dictionary © Cambridge University Press)