-ion suffix repr. (O)F. -ion — L. -iō, -iōn-, which forms nouns of condition and action from (i) adjs. or sbs., as in COMMUNION, DOMINION; (ii) verb-stems, as in LEGION; but chiefly from (iii) pp. or supine stems in t, s, x (see -TION, -SION).
The Concise Oxford Dictionary of English Etymology
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