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D-DAY

 - 4 dictionary results
D-Day at HISTORY™
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Sarum : The Novel
Edward Rutherfurd's epic saga 10,000 years of England's history
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D-day

  [dee-dey]
Use D-DAY in a Sentence
–noun
1. Military. the day, usually unspecified, set for the beginning of a planned attack.
2. June 6, 1944, the day of the invasion of western Europe by Allied forces in World War II.
3. Informal. any day of special significance, as one marking an important event or goal.
Also, D-Day.

Origin:
D (for day) + day; the same pattern as H-hour
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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D-Day at HISTORY™
Watch Military Footage & War Videos at HISTORY™. D-Day & More.
History.com
Sarum : The Novel
Edward Rutherfurd's epic saga 10,000 years of England's history
www.EdwardRutherfurd.com
D-day   (dē'dā')   
n.  

  1. The unnamed day on which an operation or offensive is to be launched.

  2. The day on which the Allied forces invaded France during World War II (June 6, 1944).


[D (abbr. of day) + day.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

D-Day

The code name for the first day of a military attack, especially the American and British invasion of German-occupied France during World War II on June 6, 1944 (see invasion of Normandy). This marked the beginning of the victory of the Allies in Europe. Germany surrendered less than a year later.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

D-day 
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 day and hour of the operation when the day and hour have not yet been determined, or where secrecy is essential" [U.S. Army Center of Military History Web site]. Now almost exclusively of June 6, 1944.
Online Etymology Dictionary, © 2001 Douglas Harper
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