Western esotericism, also called esotericism and esoterism, is a scholarly term
for a wide range ... The adjective "
only taught to or understood by members of a special group : hard to understand. : limited to a small number of people. Source: Merriam-Webster's Learner's ...
In the olden days, achieving
a. Intended for or understood by only a small group, especially one with
specialized knowledge or interests: an
Following our recent tour, keyboardist Jan has decided to part ways with
Intended for or likely to be understood by only a small number of people with a
specialized knowledge or interest: