deadline

[ded-lahyn]
noun
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.

Origin:
1855–60; dead + line1

postdeadline, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deadline (ˈdɛdˌlaɪn)
 
n
a time limit for any activity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

deadline
"time limit," 1920, Amer.Eng. newspaper jargon. Perhaps influenced by earlier use (1864) to mean the "do-not-cross" line in Civil War prisons:
"Seventeen feet from the inner stockade was the 'dead-line,' over which no man could pass and live." [Lossing, 1868]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for deadlines
Although such deadlines were seldom met, it was a point of potential conflict.
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