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Source : Webster's Revised Unabridged Dictionary (1913)

-ion \-ion\ (?; 106). [L. -io, acc. -ionem: cf. F. -ion.]
   A noun suffix denoting act, process, result of an act or a
   process, thing acted upon, state, or condition; as,
   revolution, the act or process of revolving; construction,
   the act or process of constructing; a thing constructed;
   dominion, territory ruled over; subjection, state of being
   subject; dejection; abstraction.