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}]
Source: WordNet® 2.0