D-day

noun

Definition of D-day

: a day set for launching an operation; specifically : June 6, 1944, on which Allied forces began the invasion of France in World War II

Origin and Etymology of d-day

D, abbreviation for day


D-DAY Defined for English Language Learners

D-day

noun

Definition of D-day for English Language Learners

  • : a day on which something important is planned or expected to happen


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