-tion

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-tion ME. -cio(u)n, repr. (O)F. -tion, earlier -cion, -ciun, repr. L. -tiō, -ōn-, comp. suffix f. -t- of a pp. stem + -iō, -ōn- -ION; orig. expressing the state of being what the pp. imports, e.g. complētiō COMPLETION, thence transferred to the action or process involved, and so acquiring a concr. or quasi-concr. notion, as in dictiō DICTION, nātiō birth, NATION, orātiō mode of speaking, ORATION.
So -tious repr. L. -tiōsus, forming adjs. rel. to sbs. in -tion, as ambition/ambitious, nutrition/nutritious.