What is the meaning of H-hour?

(Military) H-hour stands for one of the following: seaborne assault landing hour; specific time an operation or exercise begins
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). h-hour. Retrieved September 21, 2026, from http://smartdefine.org/h-hour/definitions/1955988
ChicagoMilitary Dictionary (DoD). 2011. "h-hour" http://smartdefine.org/h-hour/definitions/1955988 (accessed September 21, 2026).
HarvardMilitary Dictionary (DoD) 2011, h-hour, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/h-hour/definitions/1955988>.
MLAMilitary Dictionary (DoD). "h-hour" 4 April 2011. Web. 21 September 2026. <http://smartdefine.org/h-hour/definitions/1955988>