Definition of extremism noun from the Oxford Advanced Learner's Dictionary

 

extremism

 noun
noun
BrE BrE//ɪkˈstriːmɪzəm//
 
; NAmE NAmE//ɪkˈstriːmɪzəm//
 
[uncountable] Political views and systems, Terrorism
 
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political, religious, etc. ideas or actions that are extreme and not normal, reasonable or acceptable to most people political extremism See related entries: Political views and systems, Terrorism
See the Oxford Advanced American Dictionary entry: extremism