01 n. the day designated for the beginning of a planned attack by a military force; in communications the day is often otherwise unspecified for …
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1.
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.(Mil.)
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2.
6 June 1944, the day of the landing in France, by troops allied against the Germans in World War II.
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3.
the day for commencement or execution of any elaborate planned activity; -- often used jocosely.[informal]
Syn.
6 June 1944.