(1):

(n.) A secret.

(2):

(n.) A number of persons united in some close design, usually to promote their private views and interests in church or state by intrigue; a secret association composed of a few designing persons; a junto.

(3):

(n.) The secret artifices or machinations of a few persons united in a close design; intrigue.

(4):

(v. i.) To unite in a small party to promote private views and interests by intrigue; to intrigue; to plot.

(5):

(n.) Tradition; occult doctrine. See Cabala