extremism

noun

ex·​trem·​ism ik-ˈstrē-ˌmi-zəm How to pronounce extremism (audio)
Synonyms of extremismnext
1
: the quality or state of being extreme
2
: advocacy of extreme measures or views : radicalism
extremist noun or adjective

Examples of extremism in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Evidence recovered during the investigation included multiple books related to extremist ideologies — spanning right- and left-wing extremism, environmental extremism, white supremacy and anti-government beliefs — as well as explosive materials and components, according to McMahill. Alaa Elassar, CNN Money, 20 Feb. 2026 Multiple books were found in Maloney's hotel room related to extremist ideologies, including right- and left-wing extremism, environmental extremism, white supremacy and anti-government ideology. Alexandra Koch, FOXNews.com, 20 Feb. 2026 Seamus Hughes, an expert on counterterrorism and extremism at NCITE, said over the last year, there has been a dramatic shift in the volume of threats to law enforcement agents, who have increasingly become a target for people with grievances against the government. Jacob Rosen, CBS News, 19 Feb. 2026 Navalny died in February 2024 at the age of 47 while serving out a 19-year sentence in a Russian prison after being convicted on charges of extremism. Sarah Davis, The Hill, 14 Feb. 2026 See All Example Sentences for extremism

Word History

First Known Use

1865, in the meaning defined at sense 1

Time Traveler
The first known use of extremism was in 1865

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Cite this Entry

“Extremism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extremism. Accessed 24 Feb. 2026.

Kids Definition

extremism

noun
ex·​trem·​ism ik-ˈstrē-ˌmiz-əm How to pronounce extremism (audio)
1
: the quality or state of being extreme
2
: belief in and support for extreme ideas especially in politics
extremist noun or adjective

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