[ dey ]
/ deɪ /



Origin of day

before 950; Middle English; Old English dæg; cognate with German Tag
Related formshalf-day, nounpre·day, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for half-day

British Dictionary definitions for half-day (1 of 3)



a day when one works only in the morning or only in the afternoon

British Dictionary definitions for half-day (2 of 3)


/ (deɪ) /


Sir Robin. 1923–2000, British radio and television journalist, noted esp for his political interviews

British Dictionary definitions for half-day (3 of 3)


/ (deɪ) /


See also days
Related formsRelated adjective: diurnal

Word Origin for day

Old English dæg; related to Old High German tag, Old Norse dagr
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

Word Origin and History for half-day



Old English dæg "day," also "lifetime," from Proto-Germanic *dagaz (cf. Old Saxon, Middle Dutch, Dutch dag, Old Frisian dei, Old High German tag, German Tag, Old Norse dagr, Gothic dags), from PIE *dhegh-.

Not considered to be related to Latin dies (see diurnal), but rather to Sanskrit dah "to burn," Lithuanian dagas "hot season," Old Prussian 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 Old English and Middle English use of the adverbial genitive.

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for half-day


[ dā ]

See under sidereal time solar day.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with half-day


In addition to the idioms beginning with day

  • day after day
  • day and night
  • day by day
  • day in court, have one's
  • day in, day out
  • day off
  • days are numbered, one's
  • day to day

also see:

  • all in a day's work
  • any day
  • apple a day
  • bad hair day
  • break of day
  • by the day
  • call it a day
  • carry the day
  • different as night and day
  • dog days
  • every dog has its day
  • field day
  • for days on end
  • forever and a day
  • from this day forward
  • good day
  • had its day
  • happy as the day is long
  • heavenly days
  • in all one's born days
  • in the cold light of day
  • in this day and age
  • late in the day
  • make a day of it
  • make one's day
  • name the day
  • night and day
  • not give someone the time of day
  • not one's day
  • one of these days
  • order of the day
  • pass the time (of day)
  • plain as day
  • rainy day
  • red-letter day
  • Rome wasn't built in a day
  • salad days
  • save the day
  • seen better days
  • see the light of day
  • that'll be the day
  • the other day
  • time of day
  • tomorrow is another day
  • win through (the day)
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.