A day, a unit of time, is approximately the period of time during which the Earth completes one rotation with respect to the Sun (solar day). In 1960, the second was redefined in terms of the orbital motion of the Earth in year 1900, and was designated the SI base unit of time. The unit of measurement “day”, was redefined as 86 400 SI seconds and symbolized d. In 1967, the second and so the day were redefined by atomic electron transition. A civil day is usually 86 400 seconds, plus or minus a possible leap second in Coordinated Universal Time (UTC), and occasionally plus or minus an hour in those locations that change from or to daylight saving time.
Day can be defined as each of the twenty-four-hour periods, reckoned from one midnight to the next, into which a week, month, or year is divided, and corresponding to a rotation of the earth on its axis. However its use depends on its context, for example when people say ‘day and night’, ‘day’ will have a different meaning. It will mean the interval of light between two successive nights; the time between sunrise and sunset. People tend to sleep during the night and are awake at a day, in this instance ‘day’ will mean time of light between one night and the next.However, in order to be clear when using ‘day’ in that sense, “daytime” should be used distinguish it from “day” referring to a 24-hour period ; this is since daytime typically always means ‘the time of the day between sunrise and sunset. The word day may also refer to a day of the week or to a calendar date, as in answer to the question, “On which day?” The life patterns (circadian rhythms) of humans and many other species are related to Earth’s solar day and the day-night cycle.
Any period of 24 hours.
“I’ve been here for two days and a bit.”
A period from midnight to the following midnight.
“The day begins at midnight.”
Rotational period of a planet (especially Earth).
“A day on Mars is slightly over 24 hours.”
The part of a day period which one spends at one’s job, school, etc.
“I worked two days last week.”
Part of a day period between sunrise and sunset where one enjoys daylight; daytime.
“day and night;”
“I work at night and sleep during the day.”
A specified time or period; time, considered with reference to the existence or prominence of a person or thing; age; time.
“Every dog has its day.”
A period of contention of a day or less.
“The day belonged to the Allies.”
A 24-hour period beginning at 6am or sunrise.
“Your 8am forecast: The high for the day will be 30 and the low, before dawn, will be 10.”
To spend a day (in a place).
The fruit of the date palm, Phoenix dactylifera, somewhat in the shape of an olive, containing a soft, sweet pulp and enclosing a hard kernel.
“We made a nice cake from dates.”
The date palm.
“There were a few dates planted around the house.”
The addition to a writing, inscription, coin, etc., which specifies the time (especially the day, month, and year) when the writing or inscription was given, executed, or made.
“the date of a letter, of a will, of a deed, of a coin, etc.”
“US date : 05/24/08 = Tuesday, May 24th, 2008. UK date : 24/05/08 = Tuesday 24th May 2008.”
A specific day in time at which a transaction or event takes place, or is appointed to take place; a given point of time.
“the date for pleading”
“The start date for the festival is September 2.”
“Do you know the date of the wedding?”
“We had to change the dates of the festival because of the flooding.”
A point in time.
“You may need that at a later date.”
Assigned end; conclusion.
Given or assigned length of life; duration.
A pre-arranged meeting.
“I arranged a date with my Australian business partners.”
One’s companion for social activities or occasions.
“I brought Melinda to the wedding as my date.”
A romantic meeting or outing with a lover or potential lover, or the person so met.
“We really hit it off on the first date, so we decided to meet the week after.”
“We slept together on the first date.”
“The cinema is a popular place to take someone on a date.”
To note the time of writing or executing; to express in an instrument the time of its execution.
“to date a letter, a bond, a deed, or a charter”
To note or fix the time of (an event); to give the date of.
To determine the age of something.
“to date the building of the pyramids”
To take (someone) on a date, or a series of dates.
To have a steady relationship with; to be romantically involved with.
To have a steady relationship with each other; to be romantically involved with each other.
To become old, especially in such a way as to fall out of fashion, become less appealing or attractive, etc.
“This show hasn’t dated well.”
To have beginning; to begin; to be dated or reckoned.