Dictionarydead•linePronunciation: (ded'līn"), [key] —n. 1. the time by which something must be finished or submitted; the latest time for finishing something: a five o'clock deadline. 2. a line or limit that must not be passed. 3. (formerly) a boundary around a military prison beyond which a prisoner could not venture without risk of being shot by the guards. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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