1. (noun) day, twenty-four hours, twenty-four hour period, 24-hour interval, solar day, mean solar day
time for Earth to make a complete rotation on its axis
Synonyms: day, daylight, mean solar day, sidereal day, twenty-four hours, daytime, twenty-four hour period, solar day
Antonyms: dark, night, nighttime
2. (noun) day
some point or period in time
Synonyms: daylight, sidereal day, twenty-four hour period, daytime, mean solar day, twenty-four hours, solar day
Antonyms: dark, nighttime, night
3. (noun) day
a day assigned to a particular purpose or observance
Synonyms: daylight, sidereal day, twenty-four hour period, daytime, mean solar day, twenty-four hours, solar day
Antonyms: nighttime, dark, night
4. (noun) day, daytime, daylight
the time after sunrise and before sunset while it is light outside
Synonyms: day, daylight, mean solar day, sidereal day, twenty-four hours, daytime, twenty-four hour period, solar day
Antonyms: nighttime, night, dark
5. (noun) day
the recurring hours when you are not sleeping (especially those when you are working)
Synonyms: daylight, sidereal day, twenty-four hour period, daytime, mean solar day, twenty-four hours, solar day
Antonyms: night, nighttime, dark
6. (noun) day
an era of existence or influence
Synonyms: daylight, sidereal day, twenty-four hour period, daytime, mean solar day, twenty-four hours, solar day
Antonyms: dark, nighttime, night
7. (noun) day
the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis
Synonyms: daylight, sidereal day, twenty-four hour period, daytime, mean solar day, twenty-four hours, solar day
Antonyms: nighttime, night, dark
8. (noun) sidereal day, day
the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
Synonyms: day, daylight, mean solar day, sidereal day, twenty-four hours, daytime, twenty-four hour period, solar day
Antonyms: nighttime, dark, night
9. (noun) day
a period of opportunity
Synonyms: daylight, sidereal day, twenty-four hour period, daytime, mean solar day, twenty-four hours, solar day
Antonyms: nighttime, dark, night
10. (noun) Day, Clarence Day, Clarence Shepard Day Jr.
United States writer best known for his autobiographical works (1874-1935)
Synonyms: daylight, sidereal day, twenty-four hour period, daytime, mean solar day, twenty-four hours, solar day
Antonyms: dark, nighttime, night
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Synonyms and Antonyms of DAY 
