argumentation in WordNet English dictionary

1. a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning
   "I can't follow your line of reasoning"
   argumentation  logical argument  argument  line of reasoning  line 
   
2. a discussion in which reasons are advanced for and against some proposition or proposal
   "the argument over foreign aid goes on and on"
   argument  argumentation  debate