D-day

or D-Day

[ dee-dey ]
/ ˈdiˌdeɪ /

noun

Military. 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.
Informal. any day of special significance, as one marking an important event or goal.

Origin of D-day

Dutch (for day) + day; the same pattern as H-hour

Words related to d-day

climax, contingency, crisis, crossroad, crossroads, deadline, emergency, exigency, juncture, pinch, strait, target, countdown, H-hour, term

Example sentences from the Web for d-day

British Dictionary definitions for d-day

D-day

noun

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

Word Origin for D-day

C20: from D ( ay) -day; compare H-hour

Cultural definitions for d-day

D-Day

The code name for the first day of a military attack, especially the American and British invasion of German-occupied France during World War II on June 6, 1944 (see invasion of Normandy). This marked the beginning of the victory of the Allies in Europe. Germany surrendered less than a year later.