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equinox - 6 dictionary results
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e⋅qui⋅nox

  [ee-kwuh-noks, ek-wuh-]
Use equinox in a Sentence
–noun
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.
Origin:
1350–1400; ME < ML equinoxium, for L aequinoctium the time of equal days and nights (aequi- equi- + noct- (s. of nox) night + -ium -ium )
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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e·qui·nox   (ē'kwə-nŏks', ěk'wə-)   


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n.  
  1. Either of two points on the celestial sphere at which the ecliptic intersects the celestial equator.
  2. Either of the two times during a year when the sun crosses the celestial equator and when the length of day and night are approximately equal; the vernal equinox or the autumnal equinox.

[Middle English, from Old French equinoxe, from Medieval Latin aequinoxium, from Latin aequinoctium : aequi-, equi- + nox, noct-, night; see nekw-t- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Equinox

E"qui*nox\, n. [OE. equinoxium, equenoxium, L. aequinoctium; aequus equal + nox, noctis, night: cf. F. ['e]quinoxe. 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. --Longfellow.

2. Equinoctial wind or storm. [R.] --Dryden.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Language Translation for : equinox
Spanish: equinoccio,
German: die Tag— und Nachtgleiche,
Japanese: 春 分
More Translations »

equinox [(ee-kwuh-noks, ek-wuh-noks)]

The twice yearly times when the lengths of day and night are equal. At equinox, the sun is directly over the Earth's equator. The vernal equinox occurs about March 22 and the autumnal equinox about September 21.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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equinox 
c.1391, from O.Fr. equinoxe, from M.L. equinoxium "equality of night (and day)," from L. æquinoctium, from æquus "equal" + nox (gen. noctis) "night." The O.E. translation was efnniht.
Online Etymology Dictionary, © 2001 Douglas Harper
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equinox   (ē'kwə-nŏks')  Pronunciation Key 
  1. Either of the two points on the celestial sphere where the ecliptic (the apparent path of the Sun) crosses the celestial equator. ◇ The point at which the Sun's path crosses the celestial equator moving from south to north is called the vernal equinox. The vernal equinox marks the zero point in both the equatorial and ecliptic coordinate systems; horizontal angular distances (right ascension in the equatorial system and celestial longitude in the ecliptic system) are measured eastward from this point. The vernal equinox is also known as the first point of Aries because when first devised some 2,000 years ago this point occurred at the beginning of Aries in the zodiac. Because of the westward precession of the equinoxes, the vernal equinox is now located at the beginning of Pisces. ◇ The point at which the Sun's path crosses the celestial equator moving from north to south is called the autumnal equinox.
  2. Either of the two corresponding moments of the year when the Sun is directly above the Earth's equator. The vernal equinox occurs on March 20 or 21 and the autumnal equinox on September 22 or 23, marking the beginning of spring and autumn, respectively, in the Northern Hemisphere (and the reverse in the Southern Hemisphere). The days on which an equinox falls have about equal periods of sunlight and darkness. Compare solstice.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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