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Definition of arcane adjective from the Oxford Advanced Learner's Dictionary

arcane

adjective
 
/ɑːˈkeɪn/
 
/ɑːrˈkeɪn/
(formal)
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  1. secret and mysterious and therefore difficult to understand
    • the arcane rules of cricket
    Word Originmid 16th cent.: from Latin arcanus, from arcere ‘to shut up’, from arca ‘chest’.
See arcane in the Oxford Advanced American Dictionary
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