Definition of black box noun from the Oxford Advanced American Dictionary

     

    black box

     noun
    noun
     
     
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  1. 1[countable] (also flight recorder) a small machine in a plane that records all the details of each flight and is useful for finding out the cause of an accident
  2. 2[usually singular] (technology) a complicated piece of equipment, usually electronic, that you know produces particular results, but that you do not completely understand
See the Oxford Advanced Learner's Dictionary entry: black box