Radical

Radical is derived from the Latin word radix, which means "root". In various fields of endeavor, it can mean:

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;Sciences

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• in chemistry, either an atom or molecule with at least one unpaired electron, or a group of atoms, charged or uncharged, that act as a single entity in reaction. These two definitions are not functionally identical. (see radical (chemistry)).
• in mathematics:
• the n-th radical or root of a number a, written as $sqrt\{a\}$, which is a number whose n-th power is a (see radical (mathematics)).
• the radical of an algebraic group is a concept in algebraic group theory.
• the radical of an ideal is an important concept in abstract algebra.
• in linguistics, a radical consonant involves the root of the tongue.
• in grammatology, it is part of a Chinese character (see radical (Chinese character)).

;Social sciences

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• in sociology:
• one who advocates thoroughgoing analysis or change "at the root"
• in politics:
• can refer to a supporter of a revolutionary social movement
• can refer to the Radicalism (historical) movement which developed in 19th century Britain with the primary aim of electoral reform
• can refer to Radicalism (historical) left wing liberal movements in continental Europe
• can refer to a counterpart to reactionary; see Radical Republican
• can refer to member of a Radical Party
• can refer to a progressive liberal, e.g. the Radicals (UK), a group of left-wing MPs in the 19th-century British Parliament

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