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H-hour

[eych-ouuh r, -ou-er] /ˈeɪtʃˌaʊər, -ˌaʊ ər/
noun
1.
the time, usually unspecified, set for the beginning of a planned attack.
Origin
H (for hour) + hour; cf. D-day
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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