D-Day

proper noun

6 June 1944, the date when the Allies invaded western Europe in World War II.

Similar
X-Day
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Meanings

D-Day1

proper noun
  1. World War II6 June 1944, the date when the Allies invaded western Europe in World War II.
nounD-Day (plural D-Days)

plural D-Days

  1. figurativelygovernmentThe date of any major event planned for the future.

    A Ukrainian D-day is expected in weeks.

    2023 April 2, Dan Sabbagh, Ed Ram, “Surrounded and outgunned, Ukraine’s tank crews prepare for battle of Bakhmut”, in Katharine Viner, editor, The Guardian, London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 13 May 2023

    Synonyms: X-Day

D-day2

nounD-day (plural D-days)

plural D-days

  1. Alternative letter-case form of D-Day.

Synonyms & antonyms

nounThe date of any major event planned for the future.

Similar
X-Day
Also see
x-day

Origin

The D stands for day; compare H-hour.

Full word history & related roots →

Translations

Chinese Mandarin D日, D日
  • D日 (dì-rì)6 June 1944
  • D日 (dì-rì)date of any major event planned for the future
Czech den D, den D
  • den D6 June 1944
  • den Ddate of any major event planned for the future
Danish D-dag
  • D-dag6 June 1944
Finnish D-Day, h-hetki
  • D-Day6 June 1944
  • h-hetkidate of any major event planned for the future
French Jour J, Jour J
  • Jour J6 June 1944
  • Jour Jdate of any major event planned for the future
German D-Day, Tag X
  • D-Day6 June 1944
  • Tag Xdate of any major event planned for the future
Indonesian hari-H, hari-H
  • hari-H6 June 1944
  • hari-Hdate of any major event planned for the future
Korean D데이, D데이
  • D데이 (didei)6 June 1944
  • D데이 (didei)date of any major event planned for the future
Norwegian Bokmål D-dagen, D-dag
  • D-dagen6 June 1944
  • D-dagdate of any major event planned for the future
Portuguese Dia D, Dia D
  • Dia D6 June 1944
  • Dia Ddate of any major event planned for the future
Romanian Ziua-Z
  • Ziua-Z6 June 1944
Spanish Día D, Día D
  • Día D6 June 1944
  • Día Ddate of any major event planned for the future
Swedish dagen D
  • dagen D6 June 1944
Vietnamese ngày N
  • ngày Ndate of any major event planned for the future
Cite this entry
APA

D-Day. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/D-Day

MLA

“D-Day.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/D-Day. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “D-Day,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/D-Day.

Source: D-Day on Wiktionary, CC BY-SA 4.0.