作用因 さよういん Meanings Noun efficient cause (one of Aristotle's four fundamental types of answer to the question "why?") See also: 質料因 (しつりょういん). See also: 形相因 (けいそういん). See also: 目的因 (もくてきいん). Kanji 作 make. Read as サ. 用 use. Read as ヨウ. 因 cause. Read as イン. Word lists Philosophy Jinuma: Japanese Dictionary · Word lists