day

1. Any period of 24 hours.

   I've been here for two days and a bit.

2. A period from midnight to the following midnight.

   The day begins at midnight.

3. Rotational period of a planet (especially Earth).

   A day on Mars is slightly over 24 hours.

4. The part of a day period which one spends at one’s job, school, etc.

   I worked two days last week.

5. Part of a day period between sunrise and sunset where one enjoys daylight; daytime.

   day and night;  I work at night and sleep during the day.

6. A specified time or period; time, considered with reference to the existence or prominence of a person or thing; age; time.

   Every dog has its day.

7. A period of contention of a day or less.

   The day belonged to the Allies.

8. A 24-hour period beginning at 6am or sunrise.

   Your 8am forecast: The high for the day will be 30 and the low, before dawn, will be 10.

verb

To spend a day (in a place).