black box /ˈblæk.bɒx/noun 6verb 1forms 3 noun6 •Any similar device on motor vehicles, such as rail event recorders and ship trip recorders. •(informal) 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.scrutinizing all utterances recorded by the black box •A theoretical construct or device with known input and output characteristics but unknown method of operation.The authentication method and its details can be treated as a black box for purposes of this security architecture overview. •[before a noun] A type of theater characterized by a lack of decoration or complex mechanisms. •A device used in phreaking that prevents the calling party from being billed for the call placed. •Synonym of football (“the leather briefcase containing classified nuclear war plans which is always near the US President”) verb1 •To focus on the inputs and outputs without worrying about the internal complexity. formsblack boxed · black boxing · black boxes