Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for day from the 1913 edition of Webster's Revised Unabridged Dictionary. Define day using one of the most comprehensive free online dictionaries on the web.

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day
Part of Speech: noun
Results: 5
3. A specified time or period; time, considered with reference to the existence or prominence of a person or thing; age; time.
4. ( Preceded by the) Some day in particular, as some day of contest, some anniversary, etc.
5. The period of the earth's revolution on its axis. -- ordinarily divided into twenty- four hours. It is measured by the interval between two successive transits of a celestial body over the same meridian, and takes a specific name from that of the body. Thus, if this is the sun, the day ( the interval between two successive transits of the sun's center over the same meridian) is called a solar day; if it is a star, a sidereal day; if it is the moon, a lunar day. See Civil day, Sidereal day, below.
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