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equinox

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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 )
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Equinox Fitness Clubs
America's Healthiest Gym w/ 9 Los Angeles Locations. Join Equinox Now
www.Equinox.com
The Chevy Equinox Site
Check Out All Features and Specs. Plus Find Pricing & Current Offers.
www.Chevrolet.com/Equinox
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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Cultural Dictionary

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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Word Origin & History

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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