follow Dictionary.com

Stories We Like: A Guide to the Comma

D-day

[dee-dey] /ˈdiˌdeɪ/
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
Dutch (for day) + day; the same pattern as H-hour
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for D-day

D-day

noun
1.
the day, June 6, 1944, on which the Allied invasion of Europe began
2.
the day on which any large-scale operation is planned to start
Word Origin
C20: from D(ay)-day; compare H-hour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for 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, © 2010 Douglas Harper
Cite This Source
D-day in Culture

D-Day definition


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.
Cite This Source

Word of the Day

Difficulty index for D-day

Few English speakers likely know this word

Word Value for D

0
0
Scrabble Words With Friends

Quotes with D-day

Nearby words for d-day