Requiring secret or mysterious knowledge to understand.
1997: Chris Horrocks, Introducing Foucault, page 67, The Renaissance Episteme (Totem Books, Icon Books; →ISBN A “signature” was placed on all things by God to indicate their affinities — but it was hidden, hence the search for arcane knowledge. Knowing was guessing and interpreting, not observing or demonstrating.
Borrowed from Latin arcānus (“hidden, secret”), from arceō (“to shut up, enclose”); cognate with Latin arca (“a chest”).
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