[per-sen-tahyl, -til] Statistics.
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.
of or pertaining to a percentile or a division of a distribution by percentiles.

1880–85; percent + -ile

percent, percentage, percentile (see usage note at percent). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
percentile (pəˈsɛntaɪl)
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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Example sentences
Now consider the top percentile that makes an outsized share of their income through the capital gains tax.
Percentile is determined by an individual's standing within a comparison group.
But, the scores shift from round to round, so focus on the percentile.
People in the top fifth percentile of drinkers had the highest odds for anxiety.
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