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WordReference Random House Learner's Dictionary of American English © 2026
-ation, suffix. -ation is attached to some verbs or adjectives
  1. (some of which end in -ate) to form nouns, with the meaning "state or process of'': starve + -ation → starvation (= condition of starving);
    separate + -ation → separation (= state of being separate).

WordReference Random House Unabridged Dictionary of American English © 2026
-ation, 
  1. a combination of -ate 1 and -ion, used to form nouns from stems in -ate 1 (separation);
    on this model, used independently to form nouns from stems of other origin:starvation.
  • Latin -ātiōn- (stem of -ātiō), equivalent. to -ā- stem vowel + -tiōn- -tion

Collins Concise English Dictionary © HarperCollins Publishers::
-ation suffix forming nouns
  1. indicating an action, process, state, condition, or result: arbitration, cogitation, hibernation, moderation
    Compare -ion, -tion
Etymology: from Latin -ātiōn-, suffix of abstract nouns, from -ātus -ate1 + -iōn -ion
'-ation' also found in these entries (note: many are not synonyms or translations):

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Look up "-ation" at Merriam-Webster
Look up "-ation" at dictionary.com
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