Routledge Dictionary of Language and Linguistics
dialectic [Grk 
‘discussion by question and answer’]
Originally the study of correct argumentation of debatable points involving a method of dialogue developed by Aristotle and Plato for discovering the truth. Part of the linguistic trivium in the middle ages, a logical academic discipline alongside grammar and rhetoric, especially broadened as a method of cognition.
Modern rhetoric (see Perelman 1977) defines dialectic according to the classical model as the science of controversy.
Reference
Perelman, C. 1977. L’Empire rhétorique: rhétorique et argumentation. Paris.
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