D day

D-day

[dee-dey]
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

Day

[dey]
noun
1.
Benjamin Henry, 1810–89, U.S. newspaper publisher.
2.
Clarence (Shepard) [shep-erd] , 1874–1935, U.S. author.
3.
Dorothy, 1897–1980, U.S. Roman Catholic social activist, journalist, and publisher.
4.
Also, Daye. Stephen, 1594?–1668, U.S. colonist, born in England: considered the first printer in the Colonies.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
day (deɪ)
 
n
1.  Also called: civil day the period of time, the calendar day, of 24 hours' duration reckoned from one midnight to the next
2.  a.  the period of light between sunrise and sunset, as distinguished from the night
 b.  (as modifier): the day shift
3.  the part of a day occupied with regular activity, esp work: he took a day off
4.  (sometimes plural) a period or point in time: he was a good singer in his day; in days gone by; any day now
5.  the period of time, the sidereal day, during which the earth makes one complete revolution on its axis relative to a particular star. The mean sidereal day lasts 23 hours 56 minutes 4.1 seconds of the mean solar day
6.  the period of time, the solar day, during which the earth makes one complete revolution on its axis relative to the sun. The mean solar day is the average length of the apparent solar day and is some four minutes (3 minutes 56.5 seconds of sidereal time) longer than the sidereal day
7.  the period of time taken by a specified planet to make one complete rotation on its axis: the Martian day
8.  (often capital) a day designated for a special observance, esp a holiday: Christmas Day
9.  all in a day's work part of one's normal activity; no trouble
10.  at the end of the day in the final reckoning
11.  day of rest the Sabbath; Sunday
12.  end one's days to pass the end of one's life
13.  every dog has his day one's luck will come
14.  in this day and age nowadays
15.  it's early days it's too early to tell how things will turn out
16.  late in the day
 a.  very late (in a particular situation)
 b.  too late
17.  that will be the day
 a.  I look forward to that
 b.  that is most unlikely to happen
18.  a time of success, recognition, power, etc: his day will soon come
19.  a struggle or issue at hand: the day is lost
20.  a.  the ground surface over a mine
 b.  (as modifier): the day level
21.  from day to day without thinking of the future
22.  call it a day to stop work or other activity
23.  day after day without respite; relentlessly
24.  day by day gradually or progressively; daily: he weakened day by day
25.  day in, day out every day and all day long
26.  from Day 1, from Day One from the very beginning
27.  one of these days at some future time
28.  (modifier) of, relating to, or occurring in the day: the day shift
 
Related: diurnal
 
[Old English dæg; related to Old High German tag, Old Norse dagr]

Day (deɪ)
 
n
Sir Robin. 1923--2000, British radio and television journalist, noted esp for his political interviews

D-day
 
n
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
 
[C20: from D(ay)-day; compare H-hour]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

day
O.E. dæg, from P.Gmc. *dagaz, from PIE *dhegh-. Not considered to be related to L. dies (see diurnal), but rather to Skt. dah "to burn," Lith. dagas "hot season," O.Prus. dagis "summer." Meaning originally, in English, "the daylight hours," expanded to mean "the 24-hour
period" in late Anglo-Saxon times. Day off first recorded 1883; day-tripper first recorded 1897. The days in nowadays, etc. is a relic of the O.E. and M.E. use of the adverbial genitive.

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
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American Heritage
Science Dictionary
day  [%PREMIUM_LINK%]     (dā)  Pronunciation Key 
See under sidereal time, solar day.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

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.
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American Heritage
Abbreviations & Acronyms
DAY
James M. Cox Dayton [OH] International Airport
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Easton
Bible Dictionary

Day definition


The Jews reckoned the day from sunset to sunset (Lev. 23:32). It was originally divided into three parts (Ps. 55:17). "The heat of the day" (1 Sam. 11:11; Neh. 7:3) was at our nine o'clock, and "the cool of the day" just before sunset (Gen. 3:8). Before the Captivity the Jews divided the night into three watches, (1) from sunset to midnight (Lam. 2:19); (2) from midnight till the cock-crowing (Judg. 7:19); and (3) from the cock-crowing till sunrise (Ex. 14:24). In the New Testament the division of the Greeks and Romans into four watches was adopted (Mark 13:35). (See WATCHES.) The division of the day by hours is first mentioned in Dan. 3:6, 15; 4:19; 5:5. This mode of reckoning was borrowed from the Chaldeans. The reckoning of twelve hours was from sunrise to sunset, and accordingly the hours were of variable length (John 11:9). The word "day" sometimes signifies an indefinite time (Gen. 2:4; Isa. 22:5; Heb. 3:8, etc.). In Job 3:1 it denotes a birthday, and in Isa. 2:12, Acts 17:31, and 2 Tim. 1:18, the great day of final judgment.

Easton's 1897 Bible Dictionary
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