day in WordNet English dictionary

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"
   day  twenty-four hours  twenty-four hour period  24-hour interval  solar day  mean solar day 
   
2. a period of opportunity
   "he deserves his day in court"; "every dog has his day"
   day 
   
3. a day assigned to a particular purpose or observance
   "Mother's Day"
   day 
   
4. the time after sunrise and before sunset while it is light outside
   "the dawn turned night into day"; "it is easier to make the repairs in the daytime"
   day  daytime  daylight 
   
5. some point or period in time
   "it should arrive any day now"; "after that day she never trusted him again"; "those were the days"; "these days it is not unusual"
   day 
   
6. the recurring hours when you are not sleeping (especially those when you are working)
   "my day began early this morning"; "it was a busy day on the stock exchange"; "she called it a day and went to bed"
   day 
   
7. an era of existence or influence
   "in the day of the dinosaurs"; "in the days of the Roman Empire"; "in the days of sailing ships"; "he was a successful pianist in his day"
   day 
   
8. the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
   sidereal day  day 
   
9. 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?"
   day