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n. pl. ar·ca·na (-nə) or ar·ca·nums
1. A deep secret; a mystery.
2. often arcana Specialized knowledge or details unknown to or misunderstood by the average person: "a private-equity investor whose specialty was the arcana of the banking industry" (Andrew Ross Sorkin).
3. A secret essence or remedy; an elixir.

[Latin arcānum, from neuter of arcānus, secret; see arcane.]


(ɑːˈkeɪnə; -ˈkɑː-)
(Alternative Belief Systems) either of the two divisions (the minor arcana and the major arcana) of a pack of tarot cards
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Mehevi sought to enlighten my ignorance, but he failed as signally as when he had endeavoured to initiate me into the perplexing arcana of the taboo.
Indeed, it is to be feared that some of the more rustic and bashful youths of Devil's Ford, who had felt it incumbent upon them to pay their respects to the new-comers, were more at ease in this vestibule than in the arcana beyond, whose glories they could see through the open door.
The Doctor still read from cover to cover his Lancet and his Medical Journal, attended all professional gatherings, worked himself into an alternate state of exaltation and depression over the results of the election of officers, and reserved for himself a den of his own, in which before rows of little round bottles full of glycerine, Canadian balsam, and staining agents, he still cut sections with a microtome, and peeped through his long, brass, old-fashioned microscope at the arcana of nature.
I know nothing of the arcana of the Roman Catholic religion, and I am not a bigot in matters of theology, but I suspect the root of this precocious impurity, so obvious, so general in Popish countries, is to be found in the discipline, if not the doctrines of the Church of Rome.
Micawber, 'that your peregrinations in this metropolis have not as yet been extensive, and that you might have some difficulty in penetrating the arcana of the Modern Babylon in the direction of the City Road, - in short,' said Mr.
The youth is the son of my old friend, and shall not come to any harm from which the arcana of medical science can preserve him.
The Fool was the first or the most mystifying among the Major Arcana of 22 cards.
Which fortunetelling aid consists of the minor arcana and the major arcana?
The Arcana is a text adventure where play the part of a sorcerer's apprentice on a strange mission.
To save the Mageus, trained thief Esta must travel back to 1902 to steal the Ars Arcana, a magical book used by the Order to create the Brink.
Actor Ryan Gosling and producer Ken Kao have teamed up to form the production company Arcana.
Tarot/Suite of the Major Arcana" by Joseph Vranas with text by Daniel Erburu Reardon is a song cycle for soprano and tenor on poetry inspired by the Major Arcana of the traditional Tarot deck.