主しゅ原げん因いんMeaningsNoun1. principal causeKanji used主(one's) master原original因causeComposed of主しゅ(one's) master; (one's) employer; (one's) lord; leader (of a country, group, etc.); head; chief; Lord; main thing; chief part; first consideration; …Noun原げん因いんcause; origin; sourceNoun