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arcane (adj.)

1540s, from Latin arcanus "secret, hidden, private, concealed," from arcere "to close up, enclose, contain," from arca "chest, box, place for safe-keeping," from PIE root *ark- "to hold, contain, guard" (source also of Greek arkos "defense," arkein "to ward off;" Armenian argel "obstacle;" Lithuanian raktas "key," rakinti "to shut, lock").

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Definitions of arcane from WordNet

arcane (adj.)
requiring secret or mysterious knowledge;
the arcane science of dowsing
From wordnet.princeton.edu