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Definition of MOON
aoften capitalized: the earth's natural satellite that shines by the sun's reflected light, revolves about the earth from west to east in about 291⁄2 days with reference to the sun or about 271⁄3 days with reference to the stars, and has a diameter of 2160 miles (3475 kilometers), a mean distance from the earth of about 238,900 miles (384,400 kilometers), and a mass about one eightieth that of the earth —usually used with the
b: one complete moon cycle consisting of four phases
c:satellite 2; specifically: a natural satellite of a planet
: an indefinite usually extended period of time <a labor of many moons>