D-day Definition

dēdā
noun
The unnamed day on which an operation or offensive is to be launched.
American Heritage
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.
Webster's New World

(figuratively) The date of any major event planned for the future.

Wiktionary
Synonyms:
  • 6 June 1944

Other Word Forms of D-day

Noun

Singular:
D-day
Plural:
d-days

Origin of D-day

  • D (abbr. of day) day

    From American Heritage Dictionary of the English Language, 5th Edition

D-day Sentence Examples

  • You're put in a plane over Normandy on D-Day as Sgt.

  • By 1944, doctors had enough penicillin to treat all the allied forces wounded in the D Day invasion of Europe.

  • In June 1944, just in time for D-day, the APDS (armor piercing discarding sabot) shot was introduced.

  • Its historical claim to fame is being involved in the D-day landings of American troops on to the Normandy beaches in 1944.

  • Next on the journey we drove through the coastal roads of Normandy, where many years ago the famous D-day landings commenced.

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Words Near D-day in the Dictionary