[ ded-lahyn ]
/ ˈdɛdˌlaɪn /


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.

Origin of deadline

First recorded in 1855–60; dead + line1

Related forms

post·dead·line, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for deadline

British Dictionary definitions for deadline


/ (ˈdɛdˌlaɪn) /


a time limit for any activity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012