the holding or following of or extreme views or principles.
the principles or practices of .
Contemporary Examples

Osama bin Laden was a charismatic leader who could convey his very particular brand of radicalism to an international audience.
Are Al Qaeda’s Fighters Depressed? Paul Kix May 3, 2011

The Tea Party firebrand is as anti-tax as they come, to the point that some have accused him of flirting with radicalism.
Tea Party Could Sink the Tax-Cut Deal in the House Benjamin Sarlin December 14, 2010

Fortunately, TIME Magazine is reporting many of the books may have been saved from the fires of radicalism.
Mali’s Jihadists Burn their Own History Justin Green January 28, 2013

The Gorge has always been a hotbed of radicalism and arms smuggling, but now it is fast becoming a shahid factory.
The Secret Life of an ISIS Warlord Will Cathcart, Vazha Tavberidze, Nino Burchuladze October 26, 2014

Web sites are supplanting mosques, madrassas and cafes as the incubators of Islamist radicalism.
The Next ‘Jihad Jamie’? John Avlon March 13, 2010

Historical Examples

But Reinhard explained to her the next day that radicalism was the “new note.”
One Woman’s Life Robert Herrick

American radicalism is not always as innocent of the world’s experience as it looks.
The American Mind Bliss Perry

It is a radical paper, though I doubt whether any German reader would ever discover its radicalism.
Saunterings in and about London Max Schlesinger

radicalism and conservatism must combine together to make reform.
The Continental Monthly, Vol. 5, No. 5, May, 1864 Various

Distinctly does she discountenance leaps in the dark, wild driving, and the freaks of radicalism.
The Celt and Saxon, Complete George Meredith

the principles, desires, or practices of political radicals
a radical movement, esp in politics
the state or nature of being radical, esp in politics

1819 in the political sense, from radical (adj.) + -ism.


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