esoteric
- Intended for or understood by only a small, specially initiated group; requiring specialized or insider knowledge.
- Relating to mystical or occult knowledge passed on to select followers.
In a sentence
- The journal article was so esoteric that even specialists in adjacent fields struggled to follow it.
- She had an esoteric interest in medieval alchemical manuscripts that few of her friends shared.
Usage note. Esoteric implies a deliberate or structural exclusivity — the knowledge is gated — whereas 'obscure' simply means not well known; keep this distinction in mind.
Where it comes from
English esoteric · entered English mid-17th c.
From Greek esoterikos ('belonging to an inner circle'), from esotero, comparative of eso ('within'). The term was used by ancient Greek writers to describe teachings reserved for advanced disciples. It entered English in the mid-17th century.