D-dayn. 1. (Mil.) the day designated for the beginning of a planned attack by a military force; in communications the day is often otherwise unspecified for security reasons; as, the day before D-day the troops will move into position.
2. 6 June 1944, the day of the landing in France, by troops allied against the Germans in World War II.
Syn. -- 6 June 1944.
3. the day for commencement or execution of any elaborate planned activity; -- often used jocosely.
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Tue 20th April 2021