Radicalization (or radicalisation) is a process by which an individual, or group comes to adopt increasingly extreme political, social, or religious ideals and aspirations that reject or undermine the status quo or undermine contemporary ideas and expressions of the nation. The outcomes of radicalization are shaped by the ideas of the society at large; for example, radicalism can originate from a broad social consensus against progressive changes in society or from a broad desire for change in society. Radicalization can be both violent and nonviolent, although most academic literature focuses on radicalization into violent extremism (RVE). There are multiple pathways that constitute the process of radicalization, which can be independent but are usually mutually reinforcing.
Radicalization that occurs across multiple reinforcing pathways greatly increases a group’s resilience and lethality. Furthermore, by compromising its ability to blend in with non-radical society and participate in a modern, national economy, radicalization serves as a kind of sociological trap that gives individuals no other place to go to satisfy their material and spiritual needs.
There is no universally accepted definition of radicalization in academia of government. Therefore, no one definition can be presented here. One of the difficulties with defining radicalization appears to be the importance of the context to determine what is perceived as radicalization. Therefore, radicalization can mean different things to different people. Presented below is a list of definitions used by different governments.
The UK Home Office, MI5’s parent agency, defines radicalization as “The process by which people come to support terrorism and violent extremism and, in some cases, then join terrorist groups.” The MI5 report closes by saying that no single measure will reduce radicalization in the UK and that the only way to combat it is by targeting the at risk vulnerable groups and trying to assimilate them into society. This may include helping young people find jobs, better integrating immigrant populations into the local culture, and effectively reintegrating ex-prisoners into society.
The Royal Canadian Mounted Police defines radicalization as "the process by which individuals—usually young people—are introduced to an overtly ideological message and belief system that encourages movement from moderate, mainstream beliefs towards extreme views. While radical thinking is by no means problematic in itself, it becomes a threat to national security when Canadian citizens or residents espouse or engage in violence or direct action as a means of promoting political, ideological or religious extremism. Sometimes referred to as “homegrown terrorism,” this process of radicalization is more correctly referred to as domestic radicalization leading to terrorist violence.”