What is "decile"

Decil \Dec"il\, Decile \Dec"ile\, n. [F. d['e]cil, fr. L. decem ten? 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[deg].

1670s in astrology; 1882 in statistics; from French décile or Medieval Latin *decilis, from Latin decem "ten" (see ten) on the model of quintilis, sextilis.

n. 1 (context statistics English) Any of the values in a series that divides the distribution of individuals in that series into ten groups of equal frequency. 2 Any one of the ten subset or groups so divided. 3 (context astrology English) An aspect or position of two planets when they are distant from each other a tenth part of the zodiac.

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

In descriptive statistics, a decile is any of the nine values that divide the sorted data into ten equal parts, so that each part represents 1/10 of the sample or population. A decile is one possible form of a quantile; others include the quartile and percentile.