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. 2016 Dec 21;11(12):e0166947. doi: 10.1371/journal.pone.0166947

Table 1. Definitions of concepts used in the systematic review.

Concept Definition
Extremism Vocal or active opposition to fundamental values, including democracy, the rule of law, individual liberty, and mutual respect and tolerance of different faiths and beliefs [3]
Terrorism The unofficial or unauthorised use of violence and intimidation in the pursuit of political aims [5]
Fundamentalism Belief that there is one set of religious teachings that clearly contains the fundamental, basic, intrinsic essential, inerrant truth about humanity and deity [6]
Radicalisation The process by which an individual or group comes to adopt increasingly extreme political, social, or religious ideals and aspirations that either reject or undermine the status quo or reject and/or undermine contemporary ideas and expressions of freedom of choice [2]
Authoritarianism Unqualified submission to authority, as opposed to individual freedom of thought and action [7]