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quintile

[kwin-til, -tahyl] /ˈkwɪn tɪl, -taɪl/
noun
1.
Statistics. a quantile for the special case of five equal proportions.
2.
Astrology. a quintile aspect.
adjective
3.
Astrology. of or relating to the aspect of two heavenly bodies that are one fifth of the zodiac, or 72°, apart.
Origin of quintile
1600-1610
1600-10; < Latin quīnt(us) fifth + -ile (as in quartile)
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for quintile

quintile

/ˈkwɪntaɪl/
noun (astrology)
1.
an aspect of 72° between two heavenly bodies
2.
a fifth part of a distribution
Word Origin
C17: from Latin quintus fifth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for quintile
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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