Antonyms of noun day

1 of 10 senses of day

Sense 4
day, daytime, daylight -- (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")
       Antonym of night (Sense 1)
      => night, nighttime, dark -- (the time after sunset and before sunrise while it is dark outside)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun day

10 senses of day

Sense 1
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; "two days later they left"; "they put on two performances every day"; "there are 30,000 passengers per day")
       => time unit, unit of time -- (a unit for measuring time periods)

Sense 2
day -- (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")
       => time -- (an indefinite period (usually marked by specific attributes or activities); "he waited a long time"; "the time of year for planting"; "he was a great actor in his time")

Sense 3
day -- (a day assigned to a particular purpose or observance; "Mother's Day")
       => calendar day, civil day -- (a day reckoned from midnight to midnight)

Sense 4
day, daytime, daylight -- (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")
       => time period, period of time, period -- (an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period")

Sense 5
day -- (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")
       => work time -- (a time period when you are required to work)

Sense 6
day -- (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")
       => era, epoch -- (a period marked by distinctive character or reckoned from a fixed point or event)

Sense 7
day -- (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?")
       => time period, period of time, period -- (an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period")

Sense 8
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)
       => time unit, unit of time -- (a unit for measuring time periods)
       => sidereal time -- (measured by the diurnal motion of stars)

Sense 9
day -- (a period of opportunity; "he deserves his day in court"; "every dog has his day")
       => opportunity, chance -- (a possibility due to a favorable combination of circumstances; "the holiday gave us the opportunity to visit Washington"; "now is your chance")

Sense 10
Day, Clarence Day, Clarence Shepard Day Jr. -- (United States writer best known for his autobiographical works (1874-1935))
       INSTANCE OF=> writer, author -- (writes (books or stories or articles or the like) professionally (for pay))

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