-tion


-tion
a composite suffix used to form abstract nouns consisting of the final consonant of participial and other stems, plus -ion, used to express an action (revolution, commendation), or a state (contrition, volition), or associated meanings (relation, temptation).

Also, -ation, -cion, -sion, -ion, -xion. {Latin -tio (from -t, past participle stem ending, + -io, noun suffix); also representing French -tion, German -tion, etc., from Latin}

Australian English dictionary. 2014.