quartile

[kwawr-tahyl, -til] Origin

quar·tile

[kwawr-tahyl, -til]
noun
1.
Statistics. (in a frequency distribution) one of the values of a variable that divides the distribution of the variable into four groups having equal frequencies. Compare first quartile, median, third quartile.
2.
Astrology. a quartile aspect.
adjective
3.
Astrology. of or pertaining to the aspect of two heavenly bodies when their longitudes differ by 90°.

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Quartile is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.

Origin:
1500–10; < Medieval Latin quartīlis, equivalent to Latin quart(us) fourth + -īlis -ile
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
quartile (ˈkwɔːtaɪl)
 
n
1.  statistics one of three actual or notional values of a variable dividing its distribution into four groups with equal frequencies
 
adj
2.  statistics denoting or relating to a quartile
3.  astrology denoting an aspect of two heavenly bodies when their longitudes differ by 90°
4.  a quarter part of a distribution
 
[C16: from Medieval Latin quartīlis, from Latin quartus fourth]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

quartile
1450, from M.Fr. quartil, from M.L. quartilus "of a quartile," from L. quartus "fourth."
Online Etymology Dictionary, © 2010 Douglas Harper
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