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‪This interview with Christian Plantin focuses on the Dictionnaire de l’argumentation published in 2016 by ENS Éditions, Lyon; translated and adapted into English as A Dictionary of Argumentation, London, College Publications, 2018. The idea of a dictionary comes from the inexistence of such an instrument (there was no dictionary of the argumentation, neither in French nor in English), and from the need for definitions, as voiced particularly in doctoral seminars. The dictionary is grounded on four main principles: argumentation is approached 1) as an interactional and interdiscursive phenomenon; 2) as an evaluative activity, the evaluation being the responsibility of the participants, not of the analyst; 3) in relation to knowledge construction and management; 4) as necessarily involving affects and emotions.