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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Equinox \E"qui*nox\, noun [OE. equinoxium, equenoxium, L. aequinoctium; aequus equal + nox, noctis, night: cf. F. ['e]quinoxe. See {Equal}, and {Night}.]
1. 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}.
When descends on the Atlantic The gigantic Stormwind of the equinox. --Longfellow.
2. Equinoctial wind or storm. [R.] --Dryden.
From WordNet (r) 2.0 [wn]:
equinox
noun
1: either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
2: (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic [syn: {equinoctial point}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
34 Moby Thesaurus words for "equinox": aphelion, apogee, astronomical longitude, autumnal equinox, celestial equator, celestial longitude, celestial meridian, circle, colures, ecliptic, equator, equinoctial, equinoctial circle, equinoctial colure, galactic longitude, geocentric longitude, geodetic longitude, great circle, heliocentric longitude, longitude, meridian, orbit, perigee, perihelion, period, small circle, solstice, solstitial colure, summer solstice, trajectory, vernal equinox, winter solstice, zodiac, zone
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