a compound suffix of nouns, being -tion with a preceding original or formative vowel, or, in other words, a combination of -ite2. and -ion: expedition; extradition.

< Latin -itiōn- or -ītiōn-, stem of -itiō or -ītiō. See -ite2, -ion

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Ition and physiology of microbial communities in the environment.
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