H-hour

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H-hour

(āch′our′)
n.

[H (abbr. of hour) + hour.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

H-hour

n
(Military) military the specific hour at which any operation commences. Also called: zero hour
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

H-hour

See: times.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
Translations

H-hour

n (Mil) → Stunde fX (für militärische Operationen)
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007