(n)(statistics) any of nine points that divided a distribution of ranked scores into equal intervals where each interval contains one-tenth of the scores
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
{ } n. [ F. décil, fr. L. decem ten&unr_; cf. It. decile. ] (Astrol.) An aspect or position of two planets, when they are distant from each other a tenth part of the zodiac, or 36°. [ 1913 Webster ]