plural noun
things understood by or meant for a select few; recondite matters or items.
curiosa ( def 1 ).

1925–30; < Neo-Latin, noun use of neuter plural of Greek esōterikós esoteric Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To esoterica
Example sentences
There is no need to study all the parts of speech and become conversant with such esoterica as gerundives and cognate objects.
Some distilleries have resorted to out-and-out esoterica.
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