Etymology
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esoteric (adj.)

"secret; intended to be communicated only to the initiated; profound," 1650s, from Latinized form of Greek esoterikos "belonging to an inner circle" (Lucian), from esotero "more within," comparative adverb of eso "within," from PIE *ens-o-, suffixed form of *ens, extended form of root *en "in." Classically applied to certain writings of Aristotle of a scientific, as opposed to a popular, character; later to doctrines of Pythagoras. In English, first of Pythagorean doctrines.

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Definitions of esoteric

esoteric (adj.)
confined to and understandable by only an enlightened inner circle;
a compilation of esoteric philosophical theories
From wordnet.princeton.edu