Dictionary

Any period of 24 hours.

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

A period from midnight to the following midnight.

Example: The day begins at midnight.

Rotational period of a planet (especially Earth).

Example: A day on Mars is slightly over 24 hours.

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

Example: I worked two days last week.

To spend a day (in a place).

A particular time or period of vague extent.

Example: Things were more relaxed in Grandpa's days.

Life.

Example: That's how he ended his days.

During the day.

Example: She works days at the garage.