D-Day (plural D-Days)
- (historical) June 6, 1944, the date during World War II when the Allies invaded western Europe.
- (figuratively) The date of any major event planned for the future.
date of any major event planned for the future
- (figurative): X-Day
- (figurative): H-Hour
- D-Day on Wikipedia.en.Wikipedia
- D-Day (military term) on Wikipedia.en.Wikipedia:D-Day (military term)