dissertate

from WordNet (r) 3.0 (2006)

dissertate
    v 1: talk at length and formally about a topic; "The speaker
         dissertated about the social politics in 18th century
         England" [syn: {hold forth}, {discourse}, {dissertate}]

from The Collaborative International Dictionary of English v.0.48

Dissertate \Dis"ser*tate\, v. i. [L. dissertatus, p. p. of
   dissertare to discuss, intents, fr. disserere. See
   {Dissert}.]
   To deal in dissertation; to write dissertations; to
   discourse. [R.] --J. Foster.
   [1913 Webster]