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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:
Origin of -ation
< Latin -ātiōn- (stem of -ātiō), equivalent to -ā- stem vowel + -tiōn- -tion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for -ation


indicating an action, process, state, condition, or result: arbitration, cogitation, hibernation, moderation Compare -ion, -tion
Word Origin
from Latin -ātiōn-, suffix of abstract nouns, from -ātus-ate1 + -iōn-ion
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
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Word Origin and History for -ation

word-forming element for making nouns of action; see -ion.

Online Etymology Dictionary, © 2010 Douglas Harper
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