A day is the time when the sun is up and there is light. People usually work or do activities during the day. It is different from night, when it is dark.
We play outside during the day.
The day is very sunny today.
A day means all the time from one midnight to the next midnight. It includes both the light part and the dark part of the 24 hours.
There are seven days in a week.
It takes one day to finish this work.
Day can mean a specific time on the calendar. It is used to talk about special dates or days of the week.
My birthday is on this day.
Today is a good day for a party.
A day can mean a time when people do their jobs or go to school. Usually, these are weekdays, not weekends.
She works five days a week.
Today is a busy day at school.
Day can also talk about a time in history or the past. It means an old or special period when things were different.
In the day, people used horses to travel.
In her day, there was no internet.
Day can mean a time when someone is successful or important. It is used to say that everyone has a chance to be the best.
He had his day as a champion.
Everyone has a day to shine.
In science, day means the time it takes a planet to turn once showing its sunlit side. For Earth, this is about 24 hours.
A day lasts about 24 hours on Earth.
Mars has a longer day than Earth.
As a verb, day means to spend time during the day somewhere. It is old and mostly not used in modern English.
They dayed by the river in summer.
He dayed in the city during his youth.
