percentile

[per-sen-tahyl, -til]

per·cen·tile

[per-sen-tahyl, -til] Statistics.
noun
1.
one of the values of a variable that divides the distribution of the variable into 100 groups having equal frequencies: Ninety percent of the values lie at or below the ninetieth percentile, ten percent above it.
adjective
2.
of or pertaining to a percentile or a division of a distribution by percentiles.

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Percentile is always a great word to know.
So is interrobang. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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.

Origin:
1880–85; percent + -ile

percent, percentage, percentile (see usage note at percent).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
percentile (pəˈsɛntaɪl)
 
n
Also called: centile one of 99 actual or notional values of a variable dividing its distribution into 100 groups with equal frequencies; the 90th percentile is the value of a variable such that 90% of the relevant population is below that value

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
percentile   (pər-sěn'tīl')  Pronunciation Key 
Any of the 100 equal parts into which the range of the values of a set of data can be divided in order to show the distribution of those values. The percentile of a given value is determined by the percentage of the values that are smaller than that value. For example, a test score that is higher than 95 percent of the other scores is in the 95th percentile.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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