quintile

[kwin-til, -tahyl]
noun
1.
Statistics. a quantile for the special case of five equal proportions.
2.
Astrology. a quintile aspect.
adjective
3.
Astrology. of or pertaining to the aspect of two heavenly bodies that are one fifth of the zodiac, or 72°, apart.

Origin:
1600–10; < Latin quīnt(us) fifth + -ile (as in quartile)

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Forty percent of the value of this exclusion currently goes to households in
  the top income quintile.
The bottom quintile had the lowest pre-recession savings rates.
Equal sums were invested in each quintile, and dividends were reinvested.
It also means that as education becomes even more important to earnings, the
  poorer quintile is more and more locked into poverty.
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