Definition of black boxes:
(n) :
(informal, aviation) A flight recorder; the brightly colored cockpit voice recorders and flight data recorders in an aircraft designed to aid in determining the cause of an accident.
(n) :
(transport, by extension) Any similar device on motor vehicles, such as rail event recorders and ship trip recorders.
(n) :
A theoretical construct or device with known input and output characteristics but unknown method of operation.
(v) :
(web development, transitive) To focus on the inputs and outputs without worrying about the internal complexity.
(n) :
A device used in phreaking that prevents the calling party from being billed for the call placed.
(n) :
(drama, attributive) A type of theater characterized by a lack of decoration or complex mechanisms.