arcane

Adjective
US[ahr-keyn]/ˌɑrˈkeɪn/2 syllables

Open English WordNet

Adjective (1)

  1. requiring secret or mysterious knowledge“the arcane science of dowsing”Opposite exotericSimilar esoteric
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Webster's Dictionary (1913)

Ar·cane′ (…), adjective

Origin: L. arcanus.

Hidden; secret. obsolete “The arcane part of divine wisdom.” George Berkeley

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54

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