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View synonyms for H-hour
H-hour
[ eych-ouuhr, -ou-er ]
noun
, Military.
- the time, usually unspecified, set for the beginning of a planned attack.
H-hour
noun
- military the specific hour at which any operation commences Also calledzero hour
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Word History and Origins
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Example Sentences
We breathed the standard helium-oxygen mix at normal pressure until about four hours before H-hour.
From Project Gutenberg
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