Meaning of ARCANE in English

ARCANE

[adjective] [formal] - known only by a few people; mysterious; secretThe law profession has a long tradition of defending its more arcane procedures/rituals.He was the only person who understood all the arcane details of the agreement.This argument may seem arcane to those not closely involved in the world of finance.

Cambridge English vocab.      Кембриджский английский словарь.