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The term "Radical" (from the Latin radix meaning root), during the late 18th and early 19th centuries, identified proponents of democratic reform, in what subsequently became the parliamentary Radical Movement.

During the 19th century in the United Kingdom, continental Europe and Latin America, the term "Radical" came to denote a progressive liberal ideology inspired by the French Revolution. Historically, Radicalism emerged in an early form with the French Revolution and the similar movements it inspired in other countries. It grew prominent during the 1830s in the United Kingdom (the Chartists) and Belgium (see the Revolution of 1830), then across Europe in the 1840s–50s (see the Revolutions of 1848). In contrast to the social conservatism of existing liberal politics, Radicalism sought political support for a "radical reform" of the electoral system to widen the franchise. It was also associated with republicanism; civic nationalism; abolition of titles; rationalism and the resistance to a single established state religion; redistribution of property; and freedom of the press.

In nineteenth-century France, Radicalism had emerged as a minor political force by the 1840s, as the extreme left of the day (in contrast to the socially conservative liberalism of the Moderate Republicans and Orléanists monarchists, and the anti-parliamentarianism of the Legitimist monarchists and Bonapartists). By the 1890s the French Radicals were not organised under a single nationwide structure, but had become a significant political force in parliament; in 1901 they consolidated their efforts by forming the country's first major extra-parliamentary political party, the Republican, Radical and Radical-Socialist Party, which became the most important party of government during the second half (1899 to 1940) of the Third Republic. The success of the French PRRRS encouraged Radicals elsewhere to organise themselves into formal parties in a range of other countries in the late nineteenth and early twentieth century, with Radicals holding significant political office in Switzerland, Greece, Portugal, Italy, Spain, Denmark, Sweden, the Netherlands, Germany, Ireland, Bulgaria, Romania, and Russia. During the interwar, European Radical parties organised their own international, the Radical Entente.

As social democracy emerged as a distinct political force in its own right, the differences that once existed between left-wing radicalism and conservative liberalism diminished, and between 1940 and 1973 Radicalism became defunct in most of its European heartlands, its role and philosophy taken on by social democratic and conservative-liberal parties.

Radicalism and liberalism