• (astronomy) Rotational period of a planet (especially Earth).

    "A day on Mars is slightly over 24 hours."

  • 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."

  • A period from midnight to the following midnight.

    "The day begins at midnight."

  • 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."

  • Any period of 24 hours.

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

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

    "I worked two days last week."

  • A period of contention of a day or less.

    "The day belonged to the Allies."


  • (rare) To spend a day (in a place).

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