Definition of


  1. (noun, time) date of the Allied landing in France, World War II

via WordNet, Princeton University

Synonyms of D-day

6 june 1944

Origin of the word D-day

  1. 1918, "date set for the beginning of a military operation," with D as an abbreviation of day, cf. H-hour, also from the same military order of Sept. 7, 1918:
    "The First Army will attack at H-Hour on D-Day with the object of forcing the evacuation of the St. Mihiel salient." [Field Order No. 8, First Army, A.E.F.]
    "They designate the d… more

via Online Etymology Dictionary, ©2001 Douglas Harper

Words that sound like D-day

2d, 3-d, 3d, d, d.a., d.o.a., da, da'wah, dad, dada, daddy, dado, dah, dat, data, date, dated, daw, dawah, day, day-to-day, dd, ddi, ddt, de, dea, dead, dead ahead, dead heat, deadeye, deadhead, deadwood, death, death duty, ded, deed, deity

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Word of the Moment


not by design or artifice; unforced and impromptu