1. time of military action, date and time set for a military operation; June 6th 1944, date on which Allied troops invaded the beaches of Normandy in France and fought in heavy battles against Nazi troops. 2. day of the allied landing in France, World War II. 3. You can use D-day to refer to the day that is chosen for the beginning of an important activity. D-day for my departure was set for 29th June. In U.S. military history, any designated day for the commencement of a major operation. The designation apparently originated in World War I; its meaning is uncertain, though it is probable that the "D" stands for nothing more than "Day." (The designated time for commencement of action on any D-Day was referred to as H-Hour.) The most celebrated D-Day occurred on June 6, 1944, the first day of the Anglo-American invasion of Europe in World War II. See Normandy Campaign.
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