Esoteric (adj)
es-oh-te-rik
understood by or meant for only the select few who have special knowledge or interest; recondite./ belonging to the select few.
First recorded in 1645–55; from Greek esōterikós “inner,” equivalent to esṓter(os) “inner” + -ikos -ic
Example sentences
“Their esoteric meetings were only really for the inner circle.”