Definition of "esoteric"

Intended for or likely to be understood by only a small number of people with a specialized knowledge or interest, or an enlightened inner circle.  examples

Having to do with concepts that are highly theoretical and without obvious practical application; often with mystical or religious connotations.  quotations  examples

Confidential; private.  examples

An esoteric doctrine or treatise; esoteric philosophy.  examples

One who believes, or is an initiate, in esoteric doctrines or rites.  examples