Noun equinox has 2 senses
  1. equinox - 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
    --1 is a kind of
    cosmic time
    --1 has particulars:
     vernal equinox, March equinox, spring equinox; autumnal equinox, September equinox, fall equinox
  2. equinoctial point, equinox - (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
    --2 is a kind of celestial point
    --2 has particulars: vernal equinox; autumnal equinox
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