[ ˌɛsə'tɛrɪk , ˌi:sə- ]
■ adjective intended for or understood by only a small number of people with a specialized knowledge or interest.
Derivatives
~ally adverb
~ism noun
~ist noun
Origin
C17: from Gk esōterikos , from esōterō , compar. of esō 'within', from es , eis 'into'.