Meaning of ARCANE in English

ARCANE

ar ‧ cane /ɑːˈkeɪn $ ɑːr-/ BrE AmE adjective

[ Date: 1500-1600 ; Language: Latin ; Origin: arcanus 'secret' , from arca ; ⇨ ↑ ark ]

secret and known or understood by only a few people:

the arcane language of the law

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.