Part of Speech adjective
Origin + Etymology
Mid 16th century; Latin from Latin arcanus, from arcere ‘to shut up’, from arca ‘chest’
  • esoteric
  • impenetrable
  • mysterious
  • common
  • known
  • normal
known or understood by very few; mysterious; secret; obscure; esoteric
The arcane behavior of the newly discovered species was still to be learned by the biologists.
Usage Over Time

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