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Arcane (adjective)
Understood by only a few.
“esoteric”
“mundane”
“arcane rituals”
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Arcane (adjective)
Obscure, mysterious.
“enigmatic|esoteric|recondite|clandestine”
“arcane origins”
“arcane details”
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Arcane (adjective)
Requiring secret or mysterious knowledge to understand.
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Arcane (adjective)
Extremely old (e.g. interpretation or knowledge), and possibly irrelevant.
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Esoteric (adjective)
Intended for or likely to be understood by only a small number of people with a specialized knowledge or interest, or an enlightened inner circle.
“The writing in this manual is very esoteric; I’d need a degree in engineering just to understand it!”
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Esoteric (adjective)
Having to do with concepts that are highly theoretical and without obvious practical application; often with mystical or religious connotations.
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Esoteric (adjective)
Confidential; private.
“an esoteric purpose”
“an esoteric meeting”
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Esoteric (noun)
An esoteric doctrine or treatise; esoteric philosophy.
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Esoteric (noun)
One who believes, or is an initiate, in esoteric doctrines or rites.