noun Statistics.
- one of the values of a variable that divides the distribution of the variable into ten groups having equal frequencies.
noun
- statistics
- 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
- a tenth part of a distribution
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.