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Definition of callback noun from the Oxford Advanced American Dictionary

     

    callback

     noun
    noun
    NAmE//ˈkɔlbæk//
     
     
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  1. 1[countable] an occasion when you are asked to return somewhere, for example for a second interview when you are trying to get a job
  2. 2[uncountable, countable] (computing) a process by which the user of a computer or telephone system proves their identity by contacting a computer, which then contacts them
  3. 3[countable] a telephone call that you make to someone who has just called you
See callback in the Oxford Advanced Learner's Dictionary
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