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Wordnet 3.0

NOUN (1)

1. equipment that records information about the performance of an aircraft during flight;


The Collaborative International Dictionary of English v.0.48:

Black box \Black" box`\ (bl[a^]k"b[o^]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]
WordNet (r) 3.0 (2006):

black box n 1: equipment that records information about the performance of an aircraft during flight
The Free On-line Dictionary of Computing (18 March 2015):

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)