quintile

• n. 五分之一对座
• adj. 五分之一对座的（相隔72度）

quint-,五分之一，-ile,形容词后缀。引申词义五分位值。

quintile (n.)

1610s, originally in astrology, from Latin quintus "the fifth" (see quinque-) + -ile, from quartile. Use in statistics dates to 1951.