D-day

D-day
/dee"day'/, n.
1. Mil. the day, usually unspecified, set for the beginning of a planned attack.
2. June 6, 1944, the day of the invasion of western Europe by Allied forces in World War II.
3. Informal. any day of special significance, as one marking an important event or goal.
Also, D-Day.
[D (for day) + DAY; the same pattern as H-HOUR]

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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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      (in World War II), first day of the Allied landing in Normandy, France. See Normandy Invasion.

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Universalium. 2010.

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