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ation

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-ation

a combination of -ate 1 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:
< L -ātiōn- (s. of -ātiō), equiv. to -ā- s. vowel + -tiōn- -tion

-ion

a suffix, appearing in words of Latin origin, denoting action or condition, used in Latin and in English to form nouns from stems of Latin adjectives (communion; union), verbs (legion; opinion), and esp. past participles (allusion; creation; fusion; notion; torsion).
Compare -cion, -xion.


Origin:
< L -iōn- (s. of -iō) suffix forming nouns, esp. on ptp. stems; r. ME -ioun < AF < L -iōn-

-tion

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).


Origin:
< L -tiōn- (s. of -tiō), equiv. to -t(us) ptp. suffix + -iōn- -ion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

-tion 
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, © 2001 Douglas Harper
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