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Webster's Dictionary (1865)

E'qui-nōx, n.

noun

n. [Fr. équinoxe, Sp. equinoccio, It. equinozio, Lat. æquinoctium, from æquus, equal, and nox, night.]

  1. The precise time when the sun enters one of the equinoctial points.
  2. Equinoctial wind or storm. [Rare.] Dryden.

Autumnal equinox, the time when the sun enters the first point of Libra, being about the 23d of September.—Vernal equinox, the time when the sun enters the first point of Aries, being about the 21st of March.