equinox


equinox
equinox late 14c., from O.Fr. equinoce (12c.) or directly from M.L. equinoxium "equality of night (and day)," from L. aequinoctium "the equinoxes," from aequus "equal" (see EQUAL (Cf. equal)) + nox (gen. noctis) "night" (see NIGHT (Cf. night)). The O.E. translation was efnniht. Related: Equinoctial.

Etymology dictionary. 2014.

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