Source : Webster's Revised Unabridged Dictionary (1913)

Discussion \Dis*cus"sion\, n. [L. discussio a shaking,
   examination, discussion: cf. F. discussion.]
   1. The act or process of discussing by breaking up, or
      dispersing, as a tumor, or the like.

   2. The act of discussing or exchanging reasons; examination
      by argument; debate; disputation; agitation.

            The liberty of discussion is the great safeguard of
            all other liberties.                  --Macaulay.

   {Discussion of a problem} or {an equation} (Math.), the
      operation of assigning different reasonable values to the
      arbitrary quantities and interpreting the result. --Math.
      Dict.