Definition of equinox noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈiːkwɪnɒks//
; NAmE NAmE//ˈiːkwɪnɑːks//
; BrE BrE//ˈekwɪnɒks//
; NAmE NAmE//ˈekwɪnɑːks//
The sun and the moon
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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 the spring/autumn equinox Wordfinderclimate, earth, equator, equinox, hemisphere, International Date Line, latitude, map, planet, tropic Wordfinderdaylight, eclipse, equinox, ray, rise, solar, solstice, the sun, twilight, the universe See related entries: The sun and the moon Word Originlate Middle English: from Old French equinoxe or Latin aequinoctium, from aequi- ‘equal’ + nox, noct- ‘night’.
See the Oxford Advanced American Dictionary entry: equinox