Definitions

1. adjective

relating to or concerned with the study of obscure and abstruse knowledge; difficult to understand; requiring specialized knowledge

“The professor’s esoteric explanation of quantum physics confused the students.”

2. noun

something that is esoteric in nature

“The esoteric cult practiced ancient rituals in secret.”

3. adverb

in a way that is obscure or abstruse

“The philosopher spoke esoterically about the nature of reality.”