1. Time for Earth to make a complete rotation on its axis
   "two days later they left"; "they put on two performances every day"; "there are 30,000 passengers per day"; "two solar days later they left"; "two mean solar days later they left";
   - twenty-four hours, twenty-four hour period, 24-hour interval, solar day, mean solar day
    
2. The time after sunrise and before sunset while it is light outside
   "the dawn turned night into day";
   - daytime, daylight
    
3. A point or period in time
   "those were the days"; "these days it is not unusual"; "it should arrive any day now"; "after that day she never trusted him again"
    
4. The recurring hours when you are not sleeping (especially those when you are working)
   "she called it a day and went to bed"; "my day began early this morning"; "it was a busy day on the stock exchange"
    
5. A day assigned to a particular purpose or observance
   "Mother's Day"
    
6. An era of existence or influence
   "in the days of sailing ships"; "he was a successful pianist in his day"; "in the day of the dinosaurs"; "in the days of the Roman Empire"
    
7. The time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
   "A sidereal day is used in astronomical calculations";
   - sidereal day
    
8. The period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis
   "how long is a day on Jupiter?"
    
9. A period of opportunity
   "he deserves his day in court"; "every dog has his day"

1. United States writer best known for his autobiographical works (1874-1935)
   - Clarence Day, Clarence Shepard Day Jr.

Derived forms: days

Type of: author, calendar day, chance, civil day, epoch, era, opportunity, period, period of time, sidereal time, time, time period, time span, time unit, unit of time, work time, writer

Antonym: nighttime

Encyclopedia: Day, Minnesota