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equinox
late 14c., from O.Fr.
equinoxe
, from M.L.
equinoxium
"equality of night (and day)," from L.
aequinoctium,
from
aequus
"equal" +
nox
(gen.
noctis
) "night." The O.E. translation was
efnniht
. Related:
Equinoctial
.