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equinox

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Merriam-Webster's Collegiate Dictionaryequi·nox  \ˈē-kwə-ˌnäks, ˈe-\ noun ETYMOLOGY  Middle English, from Anglo-French or Medieval Latin; Anglo-French equinocce, from Medieval Latin equinoxium,alteration of Latin aequinoctium, from aequi- equi- + noct-, noxnight — more at night DATE  14th century1. either of the two points on the celestial sphere where the celestial equator intersects the ecliptic2. either of the two times each year (as about March 21 and September 23) when the sun crosses the equator and day and night are everywhere on earth of approximately equal lengthEnglish Etymologyequinox  c.1391, from O.Frhttp://O.Fr. equinoxe, from M.L. equinoxium "equality of night (and day)," from L. æquinoctium, from æquus "equal" + nox (gen. noctis) "night." The O.E. translation was efnniht.Oxford Advanced Learner's Dictionary-牛津双解-OALD7equinoxequi·nox / 5i:kwinCks; 5ek-; NAmE -nB:ks / noun   one of the two times in the year (around 20 March and 22 September) when the sun is above the equator and day and night are of equal length   二分时刻；昼夜平分时；春分；秋分:   the spring / autumn equinox    春分；秋分 Webster's Third New International Dictionary, Unabridgedequi·nox\ˈēkwəˌnäks also ˈek-\ noun(-es)Etymology: Middle English, from Middle French or Medieval Latin; Middle French equinoxe, from Medieval Latin equinoxium, alteration of Latin aequinoctium, from aequi- equi- + -noctium (from noct-, nox night) — more at night1. : either of the two times each year when the sun crosses the equator and day and night are everywhere of equal length, being about March 21 and September 23 — called also respectively vernal equinox, autumnal equinox2. : either of the two points on the celestial sphere where the celestial equator intersects the ecliptic — compare precession of the equinoxes

Night Equinox Medieval Latin Either Celestial Equator Noun