Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “D-Day”

D-Day

noun [U]     /ˈdiː.deɪ/
the day during the Second World War when the Allies began their invasion of Europe by attacking the coast of northern France: The D-Day landings began on 6 June 1944, when Allied forces invaded Normandy.Twentieth century a day when something important will happen: After four hectic weeks of electioneering, candidates are preparing themselves for D-Day (= election day) tomorrow.Turning points and deciding moments
(Definition of D-Day noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of D-Day

Word of the Day

neighbourly

friendly or helpful

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More