りがく 理学 Common word LinksSentence search for 理学Sentence search for りがくKanji details for 理 and 学Edit in JMdict Noun1. (physical) science; natural scienceNoun2. physicsObsolete term, See also 物理学Noun3. philosophyObsolete term, See also 哲学Noun4. neo-ConfucianismSee also 宋明理学 Discussions Log in to talk about this word.