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Definitions for Equinox

[1] the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September 22 (autumnal equinox) .
[2] either of the equinoctial points.
[3] either of the two occasions, six months apart, when day and night are of equal length See vernal equinox, autumnal equinox
[4] another name for equinoctial point

Words nearby Equinox

equinoctial rains, equinoctial storm, equinoctial year, equinovalgus, equinovarus, equinox, equinumerous, equip, equip., equipage, equipartition

Origin of Equinox

1350–1400; Middle English < Medieval Latin equinoxium, for Latin aequinoctium the time of equal days and nights (aequi- equi- + noct- (stem of nox ) night + -ium -ium)

Word origin for Equinox

C14: from Medieval Latin equinoxium, changed from Latin aequinoctium, from aequi- equi- + nox night