Equinox

Pronunciation

• RP IPA: /ˈɛkwɪˌnoks/, /ˈiːkwɪˌnÉ’ks/
• GenAm IPA: /ˈiːkwəˌnɑːks/

Alternative forms

• æquinox chiefly archaic

Origin

From Old French equinoce (French équinoxe), from Medieval Latin equinoxium, from Latin aequinoctium, from aequus ("equal") + nox ("night"). Replaced Old English efnniht.

Full definition of equinox

Noun

1. The intersection of the ecliptic (apparent path of the sun) with the celestial equator.

Hyponyms

• autumn equinox
• autumnal equinox
• March equinox
• September equinox
• spring equinox
• vernal equinox

Derived terms

• equinoctial
• interequinoctial
• northward equinox
• precession of the equinoxes
• southward equinox

Coordinate terms

• solstice