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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 relating to the aspect of two heavenly bodies when their longitudes differ by 90°.
Origin of quartile
1500-1510
1500-10; < Medieval Latin quartīlis, equivalent to Latin quart(us) fourth + -īlis -ile
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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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
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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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