Search Result for "d-day": 
Wordnet 3.0

NOUN (1)

1. date of the Allied landing in France, World War II;
[syn: D-day, 6 June 1944]


The Collaborative International Dictionary of English v.0.48:

D-day \D-day\ n. 1. (Mil.) the day designated for the beginning of a planned attack by a military force; in communications the day is often otherwise unspecified for security reasons; as, the day before D-day the troops will move into position. [PJC] 2. 6 June 1944, the day of the landing in France, by troops allied against the Germans in World War II. Syn: 6 June 1944. [WordNet 1.5] 3. the day for commencement or execution of any elaborate planned activity; -- often used jocosely. [informal] [PJC]
WordNet (r) 3.0 (2006):

D-day n 1: date of the Allied landing in France, World War II [syn: D-day, 6 June 1944]