The Collaborative International Dictionary of English v.0.48:

Disassent \Dis`as*sent"\, v. i.
   To dissent. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Disassent \Dis`as*sent"\, n.
   Dissent. [Obs.] --E. Hall.
   [1913 Webster]