quintile
American Heritage Dictionary:
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quin·tile
(kwĭn'tīl', kwĭnt'l) 
n.
n.
- The astrological aspect of planets distant from each other by 72° or one fifth of the zodiac.
- Statistics. The portion of a frequency distribution containing one fifth of the total sample.
[Latin quīntus, fifth + -ile (as in QUARTILE).]
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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