day

noun

1. The time when the Sun is above the horizon and it lights the sky.

   “day and night;  I work at night and sleep during the day.”

   “The day was cool and snappy for August, and the Rise all green with a lavish nature. Now we plunged into a deep shade with the boughs lacing each other overhead, and crossed dainty, rustic bridges over the cold trout-streams,[…].”

2. A period of time equal or almost equal to a full day-night cycle, being 24 hours long.

   “Holonyms: week < megasecond < fortnight < month < year < gigasecond < century < kiloannum, kiloyear, millennium < terasecond < mega-annum, megayear < petasecond < giga-annum, gigayear < exasecond < zettasecond < yottasecond < ronnasecond < quettasecond”

   “Meronyms: quectosecond < rontosecond < yoctosecond < zeptosecond < attosecond < femtosecond < picosecond < nanosecond < microsecond < millisecond < centisecond < decisecond < second < decasecond < minute < hectosecond < kilosecond < hour”

   “I've been here for two days and a bit.”

3. A period of time equal or almost equal to a full day-night cycle, being 24 hours long.
4. A period of time equal or almost equal to a full day-night cycle, being 24 hours long.
5. (informal)A 24-hour period beginning at 6am or sunrise.

   “Your 8am forecast: The high for the day will be 30 and the low, before dawn, will be 10.”

6. A period of time between two set times which mark the beginning and the end of day in a calendar, such as from midnight to the following midnight or (Judaism) from nightfall to the following nightfall.

   “The day begins at midnight.”

   “Monday is the first day of the week in many countries of the world.”

7. The rotational period of a planet.

   “A day on Mars is slightly over 24 hours.”

8. The part of a day period which one spends at one’s job, school, etc.

   “I worked two days last week.”

   ““[…]if you call my duds a ‘livery’ again there'll be trouble. It's bad enough to go around togged out like a life saver on a drill day, but I can stand that 'cause I'm paid for it. What I won't stand is to have them togs called a livery.[…]””

9. An observance lasting for a day, such as an annual holiday.

   “Christmas Day”

   “Remembrance Day”

10. A specified time or period; time, considered with reference to the existence or prominence of a person or thing; age; time; era.

    “every dog has its day; in that day; back in the day; in those days”

    “This new-comer was a man who in any company would have seemed striking.[…]Indeed, all his features were in large mold, like the man himself, as though he had come from a day when skin garments made the proper garb of men.”

    “If they had no more food than they had had in Jones's day, at least they did not have less.”

    “In his senior year, he had run across an old '66 Chevy Super Sport headed for the junkyard, bought it for a song, and overhauled it with his dad's help, turning it into the big red muscle car it was back in its day.”

11. A period of contention of a day or less.

    “The day belonged to the Allies.”

verb

1. (intransitive, rare)To spend a day (in a place).

   “I nighted and dayed in Damascus town[.]”

name

1. A surname originating as a patronymic derived from a medieval diminutive of David.
2. An English surname originating as an occupation from day as a word for a "day-servant", an archaic term for a day-laborer, or from given names such as Dagr, Daug, Dege, and Dey, cognate with Scandinavian Dag.
3. A surname from Irish can be found as both Day and O'Day from Ó Deághaidh (“descendant of a person named Good Luck”).
4. A number of places in the United States:
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11. A Mbum-Day language of Chad.