[1] : The Collaborative International Dictionary of English v.0.48

black box \black" box`\ bla^k"bo^ks`, n.
   1. any electronic instrument or part of an instrument whose
      function is defined, but which is treated as a unit
      without consideration of the internal mechanisms; broadly,
      any device whose internal workings are considered as
      incomprehensible or mysterious by the user; as, to treat
      the meter as a black box and take its readings on faith.
      pjc

   2. aviation a device which maintains a record of cockpit
      conversations and the readings of many of the instruments
      on board an aircraft, continuously or at frequent time
      intervals during a flight. it is of rugged design to
      withstand a violent crash, and is used to determine the
      causes of aircraft accidents.

   note: they are often brightly colored to assist recovery, not
         actually black.
         pjc

[2] : WordNet (r) 2.0

black box
     n : equipment that records information about the performance of
         an aircraft during flight

[3] : The Free On-line Dictionary of Computing (27 SEP 03)

black box
     
         an abstraction of a device or system in which only
        its externally visible behaviour is considered and not its
        implementation or "inner workings".
     
        see also functional testing.
     
        1997-07-03
     
     
see also:
abstraction functional testing 

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