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"
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"
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"
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"
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?"
the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
"Astronomers prefer sidereal days because they track the stars' positions more accurately than our standard clock-based measurements."
United States writer best known for his autobiographical works (1874-1935)
"No, you cannot ask Thomas Day to sign your book because he died in 1935."
Any period of 24 hours.
"The server will automatically reset all user data every day at midnight, so please save your work before then."
In plain English: A day is the amount of time it takes for the Earth to spin once on its axis, giving us one full cycle of light and dark.
"I will finish my homework before the sun goes down today."
Usage: Use "day" to refer to any continuous 24-hour period starting at midnight, such as when calculating durations or deadlines. Do not use it to mean the daylight portion of a 24-hour cycle; instead, specify "daytime" for that meaning.
To spend a day (in a place).
"We decided to drive up early just to spend a day in the mountains before heading back home."
In plain English: To day means to spend time doing something enjoyable, usually with friends.
"They plan to day on the beach all afternoon."
Usage: Use "day" as a verb to indicate spending time in a specific location, often implying a full period of 24 hours or simply residing there for the duration. You would typically say someone "days in" a village or "days at" a resort to describe where they spend their time.
A patronymic surname, from given names derived from a medieval diminutive of David.
"The linguist traveled to Chad to study Day, a Mbum-Day language spoken by local communities in the region."
A Mbum-Day language of Chad.
The word "day" comes from the Old English dæġ, which traces its roots back to a Proto-Indo-European root meaning "to burn." This original sense of burning likely referred to the heat of the sun that marks the daylight hours.