equinox
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 • Derivationally related forms: equinoctial • Hypernyms: cosmic time • Hyponyms: vernal equinox, March equinox, spring equinox, autumnal equinox, September equinox, fall equinox 2. (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic • Syn: equinoctial point • Topics: astronomy, uranology • Hypernyms: celestial point • Hyponyms: vernal equinox, autumnal equinox
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