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quartile

[kwawr-tahyl, -til] /ˈkwɔr taɪl, -tɪl/
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.
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
1500-1510
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. 2014.
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Examples from the web for quartile
  • 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.
British Dictionary definitions for quartile

quartile

/ˈkwɔːtaɪl/
noun
1.
(statistics) one of three actual or notional values of a variable dividing its distribution into four groups with equal frequencies
adjective
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
Word Origin
C16: from Medieval Latin quartīlis, from Latin quartus fourth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for quartile
n.

c.1500, originally in astronomy; see quartile (adj.). In statistics, from 1879.

adj.

mid-15c., "90 degrees apart" (of astronomical measurements), from Middle French quartil, from Medieval Latin quartilus "of a quartile," from Latin quartus "fourth" (see quart).

Online Etymology Dictionary, © 2010 Douglas Harper
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