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H-hour

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WordReference Random House Unabridged Dictionary of American English © 2026

H-hour n.

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

compare Dutch-day H (for hour) + hour

Collins Concise English Dictionary © HarperCollins Publishers::

H-hour n

the specific hour at which any operation commencesAlso called: zero hour

'H-hour' also found in these entries (note: many are not synonyms or translations):

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