Radical

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Radical means pertaining to roots, or at or in the roots. It is derived from the Latin word radix, which means "root". It may refer to:

In mathematics:

The radical symbol used to indicate the nth root of a number a, written as [\sqrt[n]], which is a number whose n-th power is a
Radical of an algebraic group, a concept in algebraic group theory
Radical of an ideal, an important concept in abstract algebra
Radical of an integer, a concept in number theory

In science:

In linguistics:

In politics:

Radicalism, any of various ideologies or political groupings
a supporter of a revolutionary social movement, opposed to liberalism and conservatism, particularly a supporter of libertarian socialism or the far-left
*a supporter of the "radical right" variety of the far right
*a neoconservative
*a supporter of the Radical Left
*The term radical is used by the right wing in the United States to mischaracterise elements of the Democratic Party
Radicalization, which refers to the transformation from passiveness or activism to more revolutionary, extremist, or militant postures. While the term "radical" can be commonly associated with far-left movements, "radicalization" makes no such distinction.

a supporter of Radicalism (historical), a movement which developed in 18th and 19th century Britain with aims including electoral reform and republicanism, and subsequent leftist liberal movements in continental Europe and Latin America
*Radical Whigs, influential early writers on Radicalism
a Radical Republican (an influential group of American politicians during the Civil War reconstruction)
a Radical Party member
a supporter of Radicals (UK), parliamentary progressives who were predecessors of the Liberal Party (UK)

In commerce:

See also