day

day/ deɪ /

noun
the interval of light between two successive nights; the time between sunrise and sunset:
Since there was no artificial illumination, all activities had to be carried on during the day.
the light of day; daylight:
The owl sleeps by day and feeds by night.
Astronomy.
Also called mean solar day. a division of time equal to 24 hours and representing the average length of the period during which the earth makes one rotation on its axis.
Also called solar day. a division of time equal to the time elapsed between two consecutive returns of the same terrestrial meridian to the sun.
Also called civil day. a division of time equal to 24 hours but reckoned from one midnight to the next.See also lunar day, sidereal day.
an analogous division of time for a planet other than the earth:
the Martian day.
the portion of a day allotted to work:
an eight-hour day.
a day on which something occurs:
the day we met.

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