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Definition of Equinox

Babylon English

either of two times in a year when the sun crosses the celestial equator; either of the two points at which the sun's path intersects with the celestial equator
Equinox Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
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.
Equinoctial wind or storm.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

\e"qui*nox\ (?), n. [oe. equinoxium, equenoxium, l. aequinoctium; aequus equal + nox, noctis, night: cf. f. équinoxe. see equal, and night.]
1. 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. when descends on the atlantic the gigantic stormwind of the equinox.
2. equinoctial wind or storm. [r.]

  similar words(4) 

 march equinox 
 spring equinox 
 vernal equinox 
 autumnal equinox 
WordNet 2.0

1. 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
(hypernym) cosmic time
(hyponym) vernal equinox, March equinox, spring equinox
2. (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
(synonym) equinoctial point
(hypernym) celestial point
(hyponym) vernal equinox
(classification) astronomy, uranology
Equinox Definition from Science & Technology Dictionaries & Glossaries
The point at which the ecliptic intersects the celestial equator. Days and nights are most nearly equal in duration. In the Northern Hemisphere, the vernal equinox falls on or about March 20 and the autumnal equinox on or about September 22.
Equinox Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
An equinox is an astronomical event in which the plane of Earth's equator passes the center of the Sun, making night and day of approximately equal length all over the planet. The equinoxes are the only times when the solar terminator (the "edge" between night and day) is perpendicular to the equator. As a result, the northern and southern hemispheres are equally illuminated.

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Equinox Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
Equinox Definition from Religion & Spirituality Dictionaries & Glossaries
Equinox [from Latin aequinoctium equal nights] The two annual epochs when the sun, in its apparent path around the ecliptic, crosses the celestial equator, occurring about March 2l and September 23, when the days and nights are equal to each other in length. The position of this intersection or node -- the equinoctial point -- on the ecliptic, at the vernal equinox in the northern hemisphere, is called the first degree of Aries in the ecliptic zodiac. But this point shifts continuously, having a retrograde motion around the ecliptic occupying about 25,920 years. This period is very important because every astronomical cycle is indicative of cosmic and human cycles. In accordance with the signs of the zodiac, it is divided into twelve parts, each of 2160 years, called in theosophy the Messianic cycle and marking the coming of a world savior. The recession of the equinoxes from Pisces into Aquarius is stated to occur somewhere about the present age, and to mark a new spiritual dispensation.
In SD 2:330, a cycle is mentioned which is obtained by compounding the processional cycle with the cycle of the apsidal revolution; this, according to figures for apsis and equinox given by modern astronomers, gives a period of about 21,000 years (probably 21,160 years).
The two equinoctial epochs of each year are also highly important as they indicate conditions favorable to certain operations, initiations, and ceremonies. These times were the ones often chosen as being favored for the celebration of the ancient Mysteries and the initiation of candidates; although the two solstices, falling in December and June, are equally important.
Glossary of Astrological Terms
Equal Night. Point in the ecliptic where the day and night is of equal duration. Vernal equinox is the first degree of Aries and the autumnal equinox is the first degree of Libra. (These points are reversed in the southern hemisphere).