Definition of ad lib verb from the Oxford Advanced American Dictionary

     

    ad lib

     verb
    verb
    NAmE//ˌæd ˈlɪb//
     
    [intransitive, transitive]Verb Forms present simple I / you / we / they ad lib he / she / it ad libs past simple ad libbed -ing form ad libbing
     
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  1. 1to say something in a speech or a performance that you have not prepared or practiced synonym improvise
  2. 2 She abandoned her script and began ad libbing. ad lib something I lost my notes and had to ad lib the whole speech. He ad libbed his way through the meeting.
The speech was full of ad libs.
ad libadjective
 
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an ad lib speech
ad libadverb
 
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She delivered her lines ad lib.