quartile

from WordNet (r) 3.0 (2006)

quartile
    n 1: (statistics) any of three points that divide an ordered
         distribution into four parts each containing one quarter of
         the scores

from The Collaborative International Dictionary of English v.0.48

Quartile \Quar"tile\, n. [F. quartile aspect, fr. L. quartus the
   fourth. See {Quart}.] (Astrol.)
   Same as {Quadrate}.
   [1913 Webster]

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