[ eych-ouuh r, -ou-er ]
/ ˈeɪtʃˌaʊər, -ˌaʊ ər /
the time, usually unspecified, set for the beginning of a planned attack.
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British Dictionary definitions for h-hour
military the specific hour at which any operation commencesAlso 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