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arcanum

ar·ca·num [ aar káynəm ] (plural ar·ca·na [ aar káynə ])


noun 
Definition:
 
1. secret known to few: a secret known only to the members of a small select group

2. secret of nature: a secret of nature, of the kind that was formerly sought by alchemists

[Late 16th century. < Latin, form of arcanus (see arcane)]
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