day
noun
ˈdā 
1
a
: the time of light between one night and the next
the shortest day of the year
b
: daylight sense 1
woke up at the break of day
c
: daytime
sleeps during the day and works at night
2
astronomy : the period of rotation of a planet (such as earth) or a moon on its axis
the length of one day on Mars
3
: the mean solar day of 24 hours beginning at midnight by mean time
open seven days a week
the first day of every month
Take one pill two times a day.
4
: a specified day or date
their wedding day
the day of her birth
5
: a specified time or period : age
in grandfather's day
—often used in plural the old daysthe days of sailing ships
6
: the conflict or contention of the day
played hard and won the day
7
: the time established by usage or law for work, school, or business
starts his day with a cup of coffee
after a long day at school
We have a busy day tomorrow.
Synonyms
- daylight
- daytime
See all Synonyms & Antonyms 
Example Sentences
We're open seven days a week, 365 days a year. Payment is due on the first day of every month. “What day of the week is the 28th?” “It's a Friday.” He spent five days in the hospital. She left on Thursday and came back four days later. That was the happiest day of my life. Parenthood gets better every day. The office is closed for the day. She works eight hours a day. It costs 10 dollars a day to park there. See More
Recent Examples on the Web Since that infamous day, Muniz’s affinity for motorsports blossomed as a result of the competitive camaraderie. —
Cole Cusumano, The Arizona Republic, 16 Feb. 2023 The parents reported that almost half of kids did not eat a vegetable every day and about a third did not eat a fruit every day. —Kyla Russell, CNN, 16 Feb. 2023 Onto her day-to-night glam: Brie applies a featherweight veil of Charlotte Tilbury’s skin-smoothing foundation. —Kiana Murden, Vogue, 15 Feb. 2023 On that fateful day on February 24,2022, the fledgling fashion brand was forced to stop production for its Spring Summer 2023 collection. —Bianca Salonga, Forbes, 14 Feb. 2023 The expansion of the universe was accelerating—getting bigger and bigger, faster and faster, every day In other words, our cosmos is getting torn apart. —Popular Mechanics, 14 Feb. 2023 The agency said in a news release that Alexander had left his home before 12 p.m. that day and was expected to return from ice fishing about six hours later. —Emily Mae Czachor, CBS News, 13 Feb. 2023 As a day-to-day matter, the armed forces under law are not allowed to collect intelligence within the U.S. —Peter Grier, The Christian Science Monitor, 10 Feb. 2023 The bakery, 4745 S. Packard Ave., will be open from 7 a.m. to 6 p.m. that day. —Hannah Kirby, Journal Sentinel, 9 Feb. 2023 See More
Cole Cusumano, The Arizona Republic, 16 Feb. 2023 The parents reported that almost half of kids did not eat a vegetable every day and about a third did not eat a fruit every day. —Kyla Russell, CNN, 16 Feb. 2023 Onto her day-to-night glam: Brie applies a featherweight veil of Charlotte Tilbury’s skin-smoothing foundation. —Kiana Murden, Vogue, 15 Feb. 2023 On that fateful day on February 24,2022, the fledgling fashion brand was forced to stop production for its Spring Summer 2023 collection. —Bianca Salonga, Forbes, 14 Feb. 2023 The expansion of the universe was accelerating—getting bigger and bigger, faster and faster, every day In other words, our cosmos is getting torn apart. —Popular Mechanics, 14 Feb. 2023 The agency said in a news release that Alexander had left his home before 12 p.m. that day and was expected to return from ice fishing about six hours later. —Emily Mae Czachor, CBS News, 13 Feb. 2023 As a day-to-day matter, the armed forces under law are not allowed to collect intelligence within the U.S. —Peter Grier, The Christian Science Monitor, 10 Feb. 2023 The bakery, 4745 S. Packard Ave., will be open from 7 a.m. to 6 p.m. that day. —Hannah Kirby, Journal Sentinel, 9 Feb. 2023 See More Word History
Etymology
Middle English, from Old English dæg; akin to Old High German tag day
First Known Use
before the 12th century, in the meaning defined at sense 1a
Phrases Containing day
Kids Definition
day
noun ˈdā
1
a
: the time of light between one night and the next
b
: daylight
2
a
: the time the earth takes to make one turn on its axis
b
: the time required for a heavenly body to turn once on its axis
a lunar day
3
: a period of 24 hours beginning at midnight
4
: a specified day or date
the day of the picnic
their wedding day
5
: a specified time or period : age
in grandmother's day
6
: the conflict or dispute of the day
fought hard and won the day
7
: the time set apart by custom or law for work
the eight-hour day
Biographical Definition
Day 1 of 3
biographical name (1)
ˈdā
Clarence Shepard, Jr. 1874–1935 American author
Day
2 of 3biographical name (2)
Thomas 1748–1789 English author
Day
3 of 3biographical name (3)
William Rufus 1849–1923 American statesman and jurist
day
noun
1
as in daytime
the hours of light between one night and the next during the day, we like to go play ball in the park Synonyms & Similar Words
Relevance
- daytime
- afternoon
- daylight
- morning
- evening
- morn
- sunshine
- sunrise
- daybreak
- sunlight
- forenoon
- dawn
- noon
- eve
- dawning
- sunset
- nightfall
- light
- sundown
- twilight
- dusk
- gloaming
Antonyms & Near Antonyms
- night
- nighttime
- dark
- darkness
- black
- blackness
2
as in time
an extent of time associated with a particular person or thing the brief but glorious day of the clipper ship Synonyms & Similar Words
- time
- era
- period
- age
- year
- epoch
- while
- generation
- cycle
- date
- span
- space
- spell
- bit
- stretch
- vintage
3
as in morning
the first appearance of light in the morning or the time of its appearance at the break of day I was relieved to realize that I had survived another night in the wilderness Synonyms & Similar Words
- morning
- sunrise
- morn
- dawning
- dawn
- daybreak
- daylight
- light
- sunup
- aurora
- sun
- daytime
- cockcrow
- forenoon
Antonyms & Near Antonyms
- night
- afternoon
- sunset
- nightfall
- midnight
- sundown
- evening
- nighttime
- midday
- dark
- darkness
- dusk
- twilight
- eventide
- gloaming