1. a 24-hour period from midnight to midnight
2. the period of light between sunrise and sunset
3. a particular date or time period

Examples

• There are seven days in a week.
• We worked all day in the garden.
• What day is your birthday?
• In my grandfather’s day, cars were rare.
• The team had its day in the 1990s.
• Day and night are caused by Earth’s rotation.
• She calls her mother every day.