-ation

-ation

a combination of -ate1. and -ion, used to form nouns from stems in -ate1, (separation ); on this model, used independently to form nouns from stems of other origin: starvation.

Origin:
< Latin -ātiōn- (stem of -ātiō), equivalent to -ā- stem vowel + -tiōn- -tion

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-ation
 
suffix forming nouns
-ion Compare -tion indicating an action, process, state, condition, or result: arbitration; cogitation; hibernation; moderation
 
[from Latin -ātiōn-, suffix of abstract nouns, from -ātus-ate1 + -iōn-ion]

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Word Origin & History

-ation
suffix forming nouns of action; see -tion.
Online Etymology Dictionary, © 2010 Douglas Harper
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