- the day, usually unspecified, set for the beginning of a planned attack.
- June 6, 1944, the day of the invasion of western Europe by Allied forces in World War II.
- any day of special significance, as one marking an important event or goal.
- the day, June 6, 1944, on which the Allied invasion of Europe began
- the day on which any large-scale operation is planned to start
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