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-ile 1

Of, relating to, or capable of: audile.

[Middle English, from Old French, from Latin -ilis, -īlis.]

-ile 2

A division of a specified size in the range of a statistic: percentile.

[From -ile as in quartile, quintile, etc.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


suffix forming adjectives, suffix forming nouns
indicating capability, liability, or a relationship with something: agile; fragile; juvenile.
[via French from Latin or directly from Latin -ilis]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


var. of -able in words borrowed from Latin, orig. suffixed to verb stems ending in a labial consonant ( labile; nubile), later added to other verb stems ( agile; docile; facile; fragile).
Compare -tile.
[< Latin -ilis, alter. of -ibilis by haplology, as habilis able from *habibilis]


a suffix of adjectives borrowed from Latin, meaning “pertaining to or characteristic of” the class of persons named by the stem: infantile; juvenile; puerile; virile.
[< Latin -ī-lis]


a suffix used to form words denoting the value of a statistical variable that divides a distribution into a given number of equal-sized groups, as specified by the initial element of the word: decile; percentile.
[on the model of quintile or sextile]


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