(no longer 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 (e.g. gumption) are not derived from Latin and are unrelated to any verb. More often, -ation is used.
Inherited from Middle English induction, from Old French induction, from Latin inductiō, from indūcō (“to lead”). By surface analysis, induct + -ion or induce + -tion.