Definition of extremist noun from the Oxford Advanced American Dictionary

 

extremist

 noun
noun
NAmE//ɪkˈstrimɪst//
 
(usually disapproving)
 
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a person whose opinions, especially about religion or politics, are extreme, and who may do things that are violent, illegal, etc. for what they believe left-wing/right-wing/political/religious extremists He was assassinated by extremists.
extremistadjective[usually before noun]
 
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extremist attacks/groups/policies