D-day

name, noun

name, noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The date of any major event planned for the future. figuratively

    "A Ukrainian D-day is expected in weeks."

  2. 2
    Alternative letter-case form of D-Day. alt-of
Proper Noun
  1. 1
    6 June 1944, the date when the Allies invaded western Europe in World War II. historical

Synonyms

All synonyms
x-day

Example

More examples

"A ceremony to honor the sacrifice of those who lost their lives in the D-Day landings in 1944 was held on Omaha Beach in Saint-Laurent-sur-Mer in France Saturday."

Etymology

The D stands for day; compare H-hour.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.