a period of twenty-four hours as a unit of time, reckoned from one midnight to the next, corresponding to a rotation of the earth on its axis, the time during which the sun is visible; daylight, a particular period of the day; a specified time

make someone's day, call it a day, have a field day

all day, day after day, day in, day out

Formal and Informal Expressions of day

In different contexts, you can replace 'day' with suitable alternatives. In a more formal setting, 'daytime, daylight' is apt. In informal speech or writing, 'daytime, daylight' is a commonplace synonym.

day: Explore its Definition & Usage

day Definition

1a period of twenty-four hours as a unit of time, reckoned from one midnight to the next, corresponding to a rotation of the earth on its axis
2the time during which the sun is visible; daylight
3a particular period of the day; a specified time

Using day: Examples

Take a moment to familiarize yourself with how "day" can be used in various situations through the following examples!

Example
I work eight hours a day.
Example
The wedding is in three days.
Example
I usually wake up at six in the morning every day.
Example
I prefer to exercise in the afternoon.

day Synonyms and Antonyms

Synonyms for day

Antonyms for day

Idioms Using day

make someone's day
to make someone very happy
Example
Her compliment really made my day.
call it a day
to stop doing something for the rest of the day, usually work
Example
We've been working for hours, let's call it a day.
have a field day
to have a great time, especially when doing something that you enjoy
Example
The kids had a field day playing in the park.

Phrases with day

all day
during the entire day; for the duration of the daylight hours
Example
I was at work all day yesterday.
day after day
repeatedly or continuously over a period of time
Example
Day after day, he would go to the park to feed the ducks.
day in, day out
happening every day over a long period of time, especially something boring or unpleasant
Example
She worked day in, day out to support her family.

Origins of day

from Old English 'dæg', meaning 'the time of light between one night and the next'

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Summary: day in Brief

The term 'day' [deɪ] refers to a period of twenty-four hours, from one midnight to the next, or the time during which the sun is visible. It can also refer to a particular period of the day. Examples include 'I work eight hours a day' and 'The wedding is in three days.' Phrases like 'all day' and idioms like 'make someone's day' are also common.