a suffix occurring in words of Latin origin, used to form abstract nouns from verbs or stems not identical with verbs, whether as expressing action (revolution; commendation ), or a state (contrition; starvation ), or associated meanings (relation; temptation ).

< Latin -tiōn- (stem of -tiō), equivalent to -t(us) past participle suffix + -iōn- -ion

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World English Dictionary
suffix forming nouns
-ation Compare -ion indicating state, condition, action, process, or result: election; prohibition
[from Old French, from Latin -tiō, -tiōn-]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

suffix forming nouns from verbs, from L. -tionem, accusative of noun suffix -tio (gen. -tionis) forming nouns of condition and action (the -t- is the Latin pp. stem).
Online Etymology Dictionary, © 2010 Douglas Harper
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