けいそういん 形相因 LinksSentence search for 形相因Sentence search for けいそういんKanji details for 形, 相 and 因Edit in JMdict Noun1. formal cause (one of Aristotle's four fundamental types of answer to the question "why?")Philosophy, See also 質料因, See also 作用因, See also 目的因 Discussions Log in to talk about this word.