Abstract

One of the positive ways in which argumentation can improve political thinking is through providing definitions. We can establish definitions through argumentation, filtering out ideas that are irrelevant or unacceptable, and collecting features that offer a comprehensive understanding of a crucial concept. In this paper, we use argumentation to illuminate the concept of extremism. We proceed in this way: first, we discuss the relationship between argumentation and definitions. Second, we look at the current state of affairs by exploring contemporary definitions of “extremism” and by identifying several problems in the definition literature. Third, we assume the burden of proof in providing a definition that avoids problems we have identified. Fourth, we discuss other closely-associated concepts and their definitions—terrorism, radicalism, and fundamentalism, explaining how these concepts are distinct from our definition of extremism.