Word parts extreme + -ism Pronunciation (UK) IPA (key): /ɪkˈstriː.mɪ.zəm/ or /ɛkˈstriː.mɪ.zəm/ (US) IPA (key): /ɪkˈstri.mɪ.zəm/ Audio (US)(file) Audio (US)(file) Noun Singular extremism Plural extremisms (countable & uncountable) Extremism is the extreme ideas or actions in politics or religion. Related words extremistWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads