the action in which a young individual or a group of people come 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 a state, which they may or may not reside in.

In historiography and genocide studies, cumulative radicalization is the notion that genocide and other mass crimes are not planned long in advance, but emerge from wartime crises and a process of radicalization.

the concept that recommender algorithms on popular social media sites such as YouTube and Facebook drive users toward progressively more extreme content over time, leading to them developing radicalized extremist political views.