day

"Day" is one of the most common words in English, and it has several useful meanings beyond just "the opposite of night." Here are the most important ones.

This is the part of the 24-hour cycle when the sun is up and it is light outside. Think of it as the opposite of night — when you can see the sky is bright.

everyday language · Modern, widely used

The children played outside all day until the sun went down.

It was a beautiful day — sunny and warm with no clouds.

She prefers to work during the day rather than at night.

2nouna 24-hour period

A day can also mean a full 24-hour block of time, from midnight to midnight. This is the sense you use when counting days on a calendar.

everyday language · Modern, widely used

There are 365 days in a year.

I will be back in three days.

Monday is my favourite day of the week.

When someone talks about 'their day,' they often mean the hours they spend working or being active — not the full 24 hours. It is the part of the day that feels 'busy.'

everyday language · Modern, widely used

I had a really long day at the office.

How was your day? — It was exhausting!

She starts her day at 7 a.m. and finishes at 5 p.m.

everyday language · Modern, widely used

That was the day I first moved to this city.

5nounfigurativea period in history or someone's life

You can use 'day' (often in the plural: 'days') to talk about a period of time in history or in a person's life. It gives a sense of an era or a phase that has passed or is ongoing.

everyday language · Modern, widely used · figurative

In my grandfather's day, there were no smartphones.

Those were the days when life felt simpler.

She was a famous singer in her day.