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-tion

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  1. 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).
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Origin of -tion

< Latin -tiōn- (stem of -tiō), equivalent to -t(us) past participle suffix + -iōn- -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -tion

-tion

suffix forming nouns
  1. indicating state, condition, action, process, or resultelection; prohibition Compare -ation, -ion
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Word Origin

from Old French, from Latin -tiō, -tiōn-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for -tion

syllable formed when the word-forming element -ion (from Latin -io) is fixed to a base or to another suffix ending in -t or -te.

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Online Etymology Dictionary, © 2010 Douglas Harper