quin·tile

[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) [Click for IPA pronunciation guide]
 
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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00:10
Quintile is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a chattering or flighty, light-headed person.
Example sentences
Time and time again, in all sorts of measurements, you're buried in the bottom
  quintile.
It also means that as education becomes even more important to earnings, the
  poorer quintile is more and more locked into poverty.
Forty percent of the value of this exclusion currently goes to households in
  the top income quintile.
Further the top quintile is in general best positioned to use the free services
  and tools provided.
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