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Definition of Equinox
1. Noun. Either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length.
Generic synonyms: Cosmic Time
Specialized synonyms: March Equinox, Spring Equinox, Vernal Equinox, Autumnal Equinox, Fall Equinox, September Equinox
Derivative terms: Equinoctial
Specialized synonyms: March Equinox, Spring Equinox, Vernal Equinox, Autumnal Equinox, Fall Equinox, September Equinox
Derivative terms: Equinoctial
2. Noun. (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic.
Exact synonyms: Equinoctial Point
Category relationships: Astronomy, Uranology
Generic synonyms: Celestial Point
Specialized synonyms: Vernal Equinox, Autumnal Equinox
Category relationships: Astronomy, Uranology
Generic synonyms: Celestial Point
Specialized synonyms: Vernal Equinox, Autumnal Equinox
Definition of Equinox
1. n. The time when the sun enters one of the equinoctial points, that is, about March 21 and September 22. See Autumnal equinox, Vernal equinox, under Autumnal and Vernal.
Definition of Equinox
1. a point on the celestial sphere [n -ES]