GNU Collaborative International Dictionary of English

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1.       
   Equinox , n. [OE. equinoxium, equenoxium, L. aequinoctium; aequus equal + nox, noctis, night: cf. F. équinoxe. See Equal, and Night.]
   The time when the sun enters one of the equinoctial points, that is, about March 21 and September 22. See Autumnal equinox, Vernal equinox, under Autumnal and Vernal.
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   When descends on the Atlantic
   The gigantic
   Stormwind of the equinox.
   Longfellow.
   
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   Equinoctial wind or storm. [R.]
   Dryden.
   
   1913 Webster