Decile is used to describe a small group composed of 10% of a larger group.

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.

One of a set of numbers on the random-variable axis that divides a probability distribution into ten equal areas. See quantile.

One of the segments of a distribution that has been divided into equal tenths. For example, the second-from-the-bottom decile of an income distribution refers to those whose income exceeds that of 10% [..]

The part of a statistical distribution that is a tenth part.

each of ten equal groups into which a data set can be divided

(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

See Socio-Economic Decile Band.

A tenth of production, e.g. the second decile represents the share of production that has a metric greater than or equal to 10% and less than 20% of the cumulative league.

(statistics) Any of the values in a series that divides the distribution of individuals in that series into ten groups of equal frequency. ''Although few people scored high marks, everyone did qui [..]