Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: the quality or state of being extreme
: advocacy of extreme measures or views : radicalism
Keep scrolling for more
Recent Examples on the Web
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'extremism.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
1865, in the meaning defined at sense 1
Resources for extremism
extremely high frequency
extremely low frequency
16 Nov 2018
Time Traveler for extremism
See more words from the same year
More Definitions for extremism
: belief in and support for ideas that are very far from what most people consider correct or reasonable
See the full definition for extremism in the English Language Learners Dictionary
More from Merriam-Webster on extremism
See words that rhyme with extremism
Britannica English: Translation of extremism for Arabic Speakers
Comments on extremism
What made you want to look up extremism? Please tell us where you read or heard it (including the quote, if possible).
a trusted follower
Get Word of the Day daily email!
Difficult Vocab Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Words from the week of 11/16/2018
This is just to say / Don't confuse them
What exactly is the 'it' being sufficed?
Taking a usage peeve to task
And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
Another round of challenging vocab!
(Secret October WOTD Quiz)
Do you know the person or title these quotes describe?