1. known or understood by very few people; mysterious or secret

Examples

• The professor’s lecture on quantum physics was filled with arcane terminology.
• She studied the arcane rituals of ancient civilizations.
• The legal document contained arcane references that only specialists could understand.
• His knowledge of arcane computer programming languages impressed his colleagues.
• The book revealed arcane secrets about medieval alchemy.
• The arcane rules of the game confused new players.
• Scholars spent years deciphering the arcane symbols on the ancient tablet.