Hypertext Webster Gateway: "quartile"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Quartile \Quar"tile\, n. [F. quartile aspect, fr. L. quartus the
fourth. See {Quart}.] (Astrol.)
Same as {Quadrate}.
From WordNet (r) 1.7 (wn)
quartile
n : (statistics) any of three points that divide an ordered
distribution into four parts each containing one quarter
of the scores
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