things understood by or meant for a select few; recondite matters or items.
Origin of esoterica
1925–30; < New Latin, noun use of neuter plural of Greek esōterikós esoteric
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
by 1807, Modern Latin, from plural of Greek esoterikos "pertaining to those within" (see esoteric).
Online Etymology Dictionary, © 2010 Douglas Harper