形けい相そう因いんMeaningsNoun1. formal cause (one of Aristotle's four fundamental types of answer to the question "why?")Kanji used形shape相towards each other因causePitch accentけいそういんComposed of形けい相そうform; appearance; form (in Aristotelianism); eidosNoun因いんcause; factor; hetu (direct cause, esp. as opposed to indirect conditions); the basis of one's argument (in hetuvidya)Noun