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.

Source : WordNet®

discussion
     n 1: an extended communication (often interactive) dealing with
          some particular topic; "the book contains an excellent
          discussion of modal logic"; "his treatment of the race
          question is badly biased" [syn: {treatment}, {discourse}]
     2: an exchange of views on some topic; "we had a good
        discussion"; "we had a word or two about it" [syn: {give-and-take},
         {word}]