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[feyl-seyf] /ˈfeɪlˌseɪf/

Electronics. pertaining to or noting a mechanism built into a system, as in an early warning system or a nuclear reactor, for insuring safety should the system fail to operate properly.
equipped with a secondary system that insures continued operation even if the primary system fails.
(sometimes initial capital letter) of, relating to, or designating a system of coded military controls in which bombers dispatched to a prearranged point as part of a standard operating procedure cannot advance farther without direct orders from a designated authority and cannot have the nuclear warheads they carry armed until they have passed their prearranged point.
guaranteed to work; totally reliable:
a fail-safe recipe for a cheese soufflé.
(sometimes initial capital letter) the point beyond which the bombers cannot go without specific instruction; the fail-safe point.
something designed to work or function automatically to prevent breakdown of a mechanism, system, or the like.
verb (used with object), fail-safed, fail-safing.
to make fail-safe.
designed to return to a safe condition in the event of a failure or malfunction
(of a nuclear weapon) capable of being deactivated in the event of a failure or accident
unlikely to fail; foolproof
(intransitive) to return to a safe condition in the event of a failure or malfunction


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  • Failure-directed testing

    programming (Or “heuristics testing”) Software testing based on the knowledge of the types of errors made in the past that are likely for the system under test. (1996-05-16)

  • Fain

    [feyn] /feɪn/ adverb 1. gladly; willingly: He fain would accept. adjective 2. content; willing: They were fain to go. 3. Archaic. constrained; obliged: He was fain to obey his Lord. 4. Archaic. glad; pleased. 5. Archaic. desirous; eager. /feɪn/ adverb 1. (usually with would) (archaic) willingly; gladly: she would fain be dead adjective 2. (obsolete) […]

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