from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A deep secret; a mystery.
- n. Specialized knowledge or detail that is mysterious to the average person: "knows the arcana of police procedure and the intricacies of litigation” ( George F. Will).
- n. A secret essence or remedy; an elixir.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mystery or deep secret.
- n. An elixir or secret remedy.
from the GNU version of the Collaborative International Dictionary of English
- n. A secret; a mystery; -- generally used in the plural.
- n. A secret remedy; an elixir.
from The Century Dictionary and Cyclopedia
- n. A secret; a mystery: generally used in the plural: as, the arcana of nature.
- n. In alchemy, a supposed great secret of nature, which was to be discovered by alchemical means; the secret virtue of anything.
- n. A secret remedy reputed to be very efficacious; a marvelous elixir.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. information known only to a special group
Latin arcānum, from neuter of arcānus, secret; see arcane.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin. (Wiktionary)