- Glossary definition: Esoteric
(Greek eso 'within')

Word used by Lucian, who attributes to Aristotle a classification of his own works into esoteric (only appropriate to) an inner circle of advanced or privileged disciples. Later used the word to designate the secret doctrines said to have been taught by Pythagoras to select disciples - it has come to denote any work restricted to a narrow, informed audience.