H-hour

[ eych-ouuhr, -ou-er ]
nounMilitary.

  1. the time, usually unspecified, set for the beginning of a planned attack.

Origin of H-hour

1
First recorded in 1918; H (for hour) + hour; cf. D-day

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

British Dictionary definitions for H-hour

H-hour
noun

  1. military the specific hour at which any operation commences: Also called: zero hour

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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