From Middle English -cioun, Old French -tion, -cion, borrowed from the stem of Latin suffix -tiō. The Middle English -cioun became -tion in Modern English under the influence of the Middle French -tion and original Latin spellings.
- (non-productive) Used to form nouns meaning "the action of (a verb)" or "the result of (a verb)". Words ending in this suffix are almost always derived from a similar Latin word; a few (eg gumption) are not derived from Latin and are unrelated to any verb.
- IPA(key): /ˈsjɔ̃/
- IPA(key): /ˈtjɔ̃/ if previous letter is "s", so "t" remains as is , like in "digestion", "question", "combustion", etc. (always stressed in the last syllable).
Borrowed as a learned form from Latin suffix -tione, ending of the singular ablative of those nouns ending with -tio (part of the Latin third declension). The original inherited form of the suffix, -on/-son (or -aison from -ātionem), is today less common but can be found in words such as raison, saison, chanson, venaison, oraison, garnison, etc.
- Used to indicate action, condition, result or effect, similar to the English suffix.