quartile

[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°.

Origin:
1500–10; < Medieval Latin quartīlis, equivalent to Latin quart(us) fourth + -īlis -ile

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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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Example sentences
Those in the bottom quartile have shown slow but steady progress, while those in the top quartile have exhibited a sharp decline.
Borrowing by the top quartile of homeowners ranked by their creditworthiness scarcely rose in response to rising house prices.
Those campuses already in the top quartile of national graduation rates are to increase their rates by six percent.
Draw a line from the lower quartile to the minimum point and another line from the upper quartile to the maximum point.
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