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Definition of: equinox
(ē′kwə·noks) noun
One of two opposite points at which the sun crosses the celestial equator, when the days and nights are equal; also, the time of this crossing (about Mar. 21, the vernal or spring equinox, and Sept. 21, the autumnal equinox). [<L aequinox <aequus equal + nox night]
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