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zero hour

noun
1.
the time set for the beginning of a military attack or operation.
2.
the time set for the beginning of any event or action.
3.
a decisive or critical time.
Origin
1915-1920
1915-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for zero hour
  • He does all of this and then at zero hour he announces that he isn't going to do anything.
  • zero hour bags were soaked in warm water and washed with the other bags in the same washing machine cycle.
  • These data shall include zero hour data, if generated.
British Dictionary definitions for zero hour

zero hour

noun
1.
(military) the time set for the start of an attack or the initial stage of an operation
2.
(informal) a critical time, esp at the commencement of an action
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
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Difficulty index for zero hour

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Word Value for zero

13
13
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