noun
day
DAY/deɪ/
The daily period defined by Earth's rotation.
Bright sunlight fills the town's quiet streets during the day.

Etymology
Old English dæg originally named the hours when the sun was above the horizon. Its meaning expanded to include the full 24-hour period, giving day its two familiar senses.
In context
… In the biblical times, a day began at sunset. So in Genesis :5, it says evening and morning were the first day.
More examples
- The package arrives in three days.
- These flowers open during the day and close at night.
- My work day ends at five.
- Grandma often talks about her days as a teacher.
Forms
day · days
daily adjective — Happening or done every day.
Similar words
- date
- Identifies a particular calendar day rather than its duration.
- daytime
- Refers only to the light hours, not the full calendar period.