Source : Webster's Revised Unabridged Dictionary (1913)

Argumentation \Ar`gu*men*ta"tion\, n. [L. argumentatio, from
   argumentari: cf. F. argumentation.]
   1. The act of forming reasons, making inductions, drawing
      conclusions, and applying them to the case in discussion;
      the operation of inferring propositions, not known or
      admitted as true, from facts or principles known,
      admitted, or proved to be true.

            Which manner of argumentation, how false and naught
            it is, . . . every man that hath with perceiveth.
                                                  --Tyndale.

   2. Debate; discussion.

   Syn: Reasoning; discussion; controversy. See {Reasoning}.

Source : WordNet®

argumentation
     n 1: a discussion in which reasons are advanced for and against
          some proposition or proposal; "the argument over foreign
          aid goes on and on" [syn: {argument}, {debate}]
     2: the methodical process of logical reasoning; "I can't follow
        your line of reasoning" [syn: {logical argument}, {line of
        reasoning}, {line}]