[des-il, -ahyl]

noun Statistics.

one of the values of a variable that divides the distribution of the variable into ten groups having equal frequencies.

Origin of decile

First recorded in 1880–85; dec- + -ile Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Contemporary Examples of decile

British Dictionary definitions for decile



  1. one of nine actual or notional values of a variable dividing its distribution into ten groups with equal frequencies: the ninth decile is the value below which 90% of the population lieSee also percentile
  2. a tenth part of a distribution

Word Origin for decile

C17: from deca- + -ile
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for decile

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.

Online Etymology Dictionary, © 2010 Douglas Harper