A proper noun "day" represents a number of places in the united states, including unincorporated communities in california, florida, minnesota, missouri, and new york, as well as townships in michigan and wisconsin.

A Mbum-Day language of Chad.

Any period of 24 hours.

(informal or meteorology) A 24-hour period beginning at 6am or sunrise.

A period from midnight to the following midnight, into which a week, month, or year is divided, based on the rotation of the earth on its axis.

(astronomy) Rotational period of a planet.

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

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

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

A period of contention of a day or less.

(Judaism) A time period from a nightfall until the following nightfall

(rare, intransitive) To spend a day (in a place).