D-day meaning

dē'dā'
D-day is defined as a day when a military attack or important event is planned to take place.

An example of D-day was June 6, 1944 when France was invaded by the Allied forces in World War II.

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The unnamed day on which an operation or offensive is to be launched.
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The day on which the Allied forces invaded France during World War II (June 6, 1944).
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The day on which a military attack or other important event is to take place; specif., June 6, 1944, the day of the invasion of W Europe by Allied forces in WWII.
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(historical) June 6, 1944, the date during World War II when the Allies invaded western Europe.
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(figuratively) The date of any major event planned for the future.
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Origin of d-day

D (abbr. of day) day