the interval of light between two successive nights; the time between sunrise and sunset: Since there was no artificial illumination, all activities had to be carried on during the day.
the light of day; daylight: The owl sleeps by day and feeds by night.
Astronomy.
Also called mean solar day.a division of time equal to 24 hours and representing the average length of the period during which the earth makes one rotation on its axis.
Also called solar day.a division of time equal to the time elapsed between two consecutive returns of the same terrestrial meridian to the sun.
Also called civil day.a division of time equal to 24 hours but reckoned from one midnight to the next.See also lunar day, sidereal day.
an analogous division of time for a planet other than the earth: the Martian day.
the portion of a day allotted to work: an eight-hour day.
a day on which something occurs: the day we met.
(often initial capital letter)a day assigned to a particular purpose or observance: New Year's Day.
a time considered as propitious or opportune: His day will come.
a day of contest or the contest itself: to win the day.
Often days. a particular time or period: the present day; in days of old.
Usually days. period of life or activity: His days are numbered.
period of existence, power, or influence: in the day of the dinosaurs.
Also called: civil daythe period of time, the calendar day, of 24 hours' duration reckoned from one midnight to the next
the period of light between sunrise and sunset, as distinguished from the night
(as modifier)the day shift
the part of a day occupied with regular activity, esp workhe took a day off
(sometimes plural)a period or point in timehe was a good singer in his day; in days gone by; any day now
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
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
the period of time taken by a specified planet to make one complete rotation on its axisthe Martian day
(often capital)a day designated for a special observance, esp a holidayChristmas Day
all in a day's workpart of one's normal activity; no trouble
at the end of the dayin the final reckoning
day of restthe Sabbath; Sunday
end one's daysto pass the end of one's life
every dog has his dayone's luck will come
in this day and agenowadays
it's early daysit's too early to tell how things will turn out
late in the day
very late (in a particular situation)
too late
that will be the day
I look forward to that
that is most unlikely to happen
a time of success, recognition, power, etchis day will soon come
a struggle or issue at handthe day is lost
the ground surface over a mine
(as modifier)the day level
from day to daywithout thinking of the future
call it a dayto stop work or other activity
day after daywithout respite; relentlessly
day by daygradually or progressively; dailyhe weakened day by day
day in, day outevery day and all day long
from Day 1orfrom Day Onefrom the very beginning
one of these daysat some future time
(modifier)of, relating to, or occurring in the daythe day shift
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.
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