りゆうげんり 理由の原理 LinksSentence search for 理由の原理Sentence search for りゆうのげんりKanji details for 理, 由 and 原Edit in JMdict Expressions (phrases, clauses, etc.), Noun1. principle of sufficient reasonPhilosophy, See also 充足理由の原理 Discussions Log in to talk about this word.