'Quartile' definitions:

Definition of 'quartile'

From: WordNet
noun
(statistics) any of three points that divide an ordered distribution into four parts each containing one quarter of the scores

Definition of 'Quartile'

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