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D-day

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

(noun)

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

See D-day in Webster's New World College Dictionary

noun

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

Origin: D, the first letter of day

See D-day in American Heritage Dictionary 4

noun

The unnamed day on which an operation or offensive is to be launched.
The day on which the Allied forces invaded France during World War II (June 6, 1944).

Origin:

Origin: D (abbr. of day)

Origin: + day

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