quintile

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quin·tile

 (kwĭn′tīl′, kwĭnt′l)
n.
1. The astrological aspect of planets distant from each other by 72° or one fifth of the zodiac.
2. Statistics
a. Any of the groups that result when a frequency distribution is divided into five groups of equal size.
b. Any of the values that separate each of these groups.

[Latin quīntus, fifth; see penkwe in Indo-European roots + -ile (as in quartile).]

quintile

(ˈkwɪntaɪl)
n
1. (Astrology) an aspect of 72° between two heavenly bodies
2. (Astrology) a fifth part of a distribution
[C17: from Latin quintus fifth]