Etymology
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-meter 
word-forming element meaning "device or instrument for measuring;" commonly -ometer, occasionally -imeter; from French -mètre, from Greek metron "a measure," from PIE root *me- (2) "to measure."
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-metry 

word-forming element meaning "process of measuring," Middle English -metrie, from French -metrie, from Latin -metria, from Greek -metria "a measuring of," from -metros "measurer of," from metron "measure," from PIE root *me- (2) "to measure."

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-ability 
word-forming element expressing ability, fitness, or capacity, from Latin -abilitas, forming nouns from adjectives ending in -abilis (see -able). Not etymologically related to ability, though popularly connected with it.
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-ile 
also -il, word-forming element denoting ability or capacity, from Old French -il or directly from Latin adjectival suffix -ilis. Used in classical and Medieval Latin to form ordinal numbers, which accounts for its use from late 19c. in statistics (percentile, etc.).
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-athon 

also -thon, a word-forming element, denoting prolonged activity and usually some measure of endurance, abstracted from marathon (q.v.). Examples include walkathon (1931), skatathon (1933); talkathon (1948); telethon (1949).

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