D-day

American  

[dee-dey] / ˈdiˌdeɪ /

Or D-Day

noun

1. Military. the day, usually unspecified, set for the beginning of a planned attack.

2. June 6, 1944, the day of the invasion of western Europe by Allied forces in World War II.

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

---

D-day British  

noun

1. the day, June 6, 1944, on which the Allied invasion of Europe began

2. the day on which any large-scale operation is planned to start

---

D-Day Cultural  

1. 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.

---

Etymology

Origin of D-day

First recorded in 1918; D (for day ) + day; the same pattern as H-hour

Example Sentences

Veterans, officials and visitors commemorate D-day on the beaches of Normandy to honor those who fought for freedom in Europe in World War II.

From Los Angeles Times • Jun. 6, 2024

Mr Gething said he "could and should, in my view, have been elsewhere" - that is likely to be a reference to the D-day commemoration in Portsmouth that he cannot attend because of the debate.

From BBC • Jun. 4, 2024

Griffin’s father, Edgar G. Griffin, born in Mexico to an Irish family, was a 101st Airborne paratrooper who survived the Normandy landing on D-day and was awarded a Purple Heart.

From Los Angeles Times • Feb. 21, 2024

In late 2020, as Flash D-day drew near, supporters scrambled to rescue it.

From Slate • Feb. 5, 2021

Danny Akee always seemed to have a funny story to tell, even about D-day on Saipan.

From "Code Talker: A Novel About the Navajo Marines of World War Two" by Joseph Bruchac