quintile
noun [ C ] uk/ˈkwɪn.taɪl/ us/ˈkwɪn.taɪl/
mathematics specialized五分之一
one of five equal measurements that a set of things can be divided into
Those in the bottom quintile are the 20 percent with the lowest incomes. 处于最底层五分之一的人也就是收入最低的20%。
Compare: quartile