the time by which something must be finished or submitted; the latest time for finishing something: a five o'clock deadline.
a line or limit that must not be passed.
(formerly) a boundary around a military prison beyond which a prisoner could not venture without risk of being shot by the guards.

1855–60; dead + line1

postdeadline, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
deadline (ˈdɛdˌlaɪn)
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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Word Origin & History

"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
However, the government has reportedly reneged on this mandate, and has
  postponed that deadline indefinitely.
There is never an acceptable excuse for missing deadline.
Today is the deadline for nations to submit their proposals.
The family had not issued a statement at deadline and no reports on her
  condition had been confirmed.
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