Added 10 October 2026 extremism /ɪkˈstɹiː.mɪ.zəm/ noun Categories: Mind & IdeasRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about extremism at Wordnik → Where our words come from → Any political theory favoring immoderate uncompromising policies. Related Words: radicalismradicalizationradicalbigotryfundamentalismfanaticismterrorismmilitancyextremeexaggerationstrictnessstringency Back to today's word