The Collaborative International Dictionary of English v.0.48:

Anacoenosis \An`a*c[oe]*no"sis\, n. [Gr. ?, fr. ?, to
   communicate; ? up + ? to make common, ? common.] (Rhet.)
   A figure by which a speaker appeals to his hearers or
   opponents for their opinion on the point in debate. --Walker.
   [1913 Webster]