Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
d-day is a noun meaning "date of the Allied landing in France, World War II". It carries one recorded sense.
date of the Allied landing in France, World War II
Definitions, synonyms and semantic relations for d-day come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.