quartile

[ kwawr-tahyl, -til ]

Phonetic (Standard)IPA

noun

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.
Astrology. a quartile aspect.

Astrology. of or relating to the aspect of two heavenly bodies when their longitudes differ by 90°.

quartile

/ ˈkwɔːtaɪl /

statistics one of three actual or notional values of a variable dividing its distribution into four groups with equal frequencies

statistics denoting or relating to a quartile
astrology denoting an aspect of two heavenly bodies when their longitudes differ by 90°
a quarter part of a distribution

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

C16: from Medieval Latin quartīlis, from Latin quartus fourth

Of course, that's just an illustration; people don't mechanically drop down a quartile by getting more education.

A 3rd quartile candidate with "some college"earning $1085 a week becomes a second-quartile BA holder earning . . . $1066.

The upper quartile or group will now contain that fourth of the class whose grades were highest.

First Quartile--Fairly clear; illumination of actual scene is fairly represented.

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