Source : Webster's Revised Unabridged Dictionary (1913)

Dissert \Dis*sert"\, v. i. [L. dissertus, p. p. of disserere;
   dis- + serere to join, connect: cf. F. disserter. See
   {Series}.]
   To discourse or dispute; to discuss. [R.]

         We have disserted upon it a little longer than was
         necessary.                               --Jeffrey.