/ ɑːˈkeɪnə; NAmE ɑːrˈk-/ noun
1.
[ pl. ] things that are secret or mysterious
2.
[ sing. ] either of the two groups of cards in a tarot pack / deck , the major arcana and the minor arcana .
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WORD ORIGIN
mid 16th cent.: from Latin , neuter plural of arcanus , from arcere to shut up, from arca chest.