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English definition of “ad lib”

ad lib

adverb uk   us  
said without any preparation or practice: I'd forgotten the notes for my speech so I had to do it ad lib.Not expected or planned
ad-lib
adjective [before noun] uk   us  
ad-lib commentsNot expected or planned
(Definition of ad lib adverb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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