An Etymological Dictionary of Astronomy and Astrophysics

In statistics, any of the four groups of a frequency distribution each containing 25% of the total number of individual observations.

Etymology (EN): From M.L. quartilis, from quart(us) “fouth” + -ilis “-ile” a suffix of adjectives expressing capability, susceptibility, liability, aptitude.

Etymology (PE): Cârakvâr, from cârak, → quarter, + -vâr suffix of similarity, size, aptitude.