esoteric
意味
- (興味・知識などが)少数の人だけの
- 難解な
- 秘密の
語源
英語の原文（Wiktionary）
Learned borrowing from Ancient Greek ἐσωτερικός (esōterikós, “belonging to an inner circle”), from ἐσωτέρω (esōtérō, “further inside”), comparative of ἔσω (ésō, “within”), from ἐς (es), εἰς (eis, “into”) (the term esoteric referred originally to the secret teachings of Greek philosophers, versus public or exoteric ones).