- A period of 24 hours.
- The period from midnight to the following midnight. There are 7 days in a week: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday.
- Rotational period of a planet (especially earth).
- The part of a day period which one spends at one’s job, school, etc.
- I worked two days last week.
- Part of a day period between sunrise and sunset where one enjoys daylight, daytime.
- day and night.
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