One entry found for equinox.

Main Entry: equi·nox
Pronunciation: -kw-näks, ek-w-
Function: noun
Etymology: Latin equinoxium (same meaning), derived from earlier Latin aequi- "equal" and noct-, nox "night" --related to NOCTURNAL
: either of the two times each year about March 21 and September 23 when the sun appears overhead at the equator and day and night are everywhere of equal length

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