The Collaborative International Dictionary of English v.0.48:

Monology \Mo*nol"o*gy\, n. [Gr. ?.]
   The habit of soliloquizing, or of monopolizing conversation.
   [1913 Webster]

         It was not by an insolent usurpation that Coleridge
         persisted in monology through his whole life. --De
                                                  Quincey.
   [1913 Webster] Monomachia