Antonym: night. Similar words: day after day, by day, all day, one day, today, the other day, yesterday, night and day. Meaning: [deɪ] 
n. 1. time for Earth to make a complete rotation on its axis 2. some point or period in time 3. the time after sunrise and before sunset while it is light outside 4. a day assigned to a particular purpose or observance 5. the recurring hours when you are not sleeping (especially those when you are working) 6. an era of existence or influence 7. a period of opportunity 8. the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis 9. the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day 10. United States writer best known for his autobiographical works (1874-1935).
n. 1. time for Earth to make a complete rotation on its axis 2. some point or period in time 3. the time after sunrise and before sunset while it is light outside 4. a day assigned to a particular purpose or observance 5. the recurring hours when you are not sleeping (especially those when you are working) 6. an era of existence or influence 7. a period of opportunity 8. the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis 9. the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day 10. United States writer best known for his autobiographical works (1874-1935). 271. One day Robinson Crusoe espied a foot print on the sand.
272. She's on the beach all day, trying to get a really deep suntan.
More similar words: day after day, by day, all day, one day, today, the other day, yesterday, night and day, day and night.