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From Nordan Symposia
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'''Radical''' (from Latin radicis, genitive of radix "root") can refer to many different things and concepts.
==Etymology==
==Etymology==
post-classical Latin radicalis relating to or forming the root, original, primary (c400 in Augustine), radical, fundamental (a1250, 1620 in British sources), of or belonging to the root of a word (1572 in the passage translated in quot. 1573 at sense A. 4a) < classical Latin r{amac}d{imac}c-, r{amac}d{imac}x RADIX n. + -{amac}lis -AL suffix1.
post-classical Latin radicalis relating to or forming the root, original, primary (c400 in Augustine), radical, fundamental (a1250, 1620 in British sources), of or belonging to the root of a word (1572 in the passage translated in quot. 1573 at sense A. 4a) < classical Latin r{amac}d{imac}c-, r{amac}d{imac}x RADIX n. + -{amac}lis -AL suffix1.
With use as adjective compare Middle French, French radical profound, intense, absolute (c1465), designating the humour or moisture once thought to be present in all living organisms as a necessary condition of their vitality (1516 in humide radical, 1587 in humeur radicale), relating to the root, of or from the root (1611), (in linguistics) relating to the root of a word (1660 in lettre radicale), (of a treatment) directed against the root or cause of a disease (1754 in cure radicale), (in mathematics) relating to or forming the root of a number or quantity (1762 in signe radical), advocating thorough or far-reaching political or social reforms (a1793). With use as noun compare French radical (in linguistics) root of a word (1754), (in chemistry) (1787: see below), (in mathematics) quantity that forms or is expressed as the root of another quantity (1798), person who advocates radical or far-reaching political or social reform, member of a political party or part of a party pursuing such aims (1820 with reference to politics in England, 1830 with reference to politics in France). Compare also Old Occitan radical (c1350 as adjective in humiditat radical), Catalan radical (14th cent. or earlier as adjective in humit radical), Spanish radical (c1418 as adjective in humidad radical), Portuguese radical (a1580 as adjective), Italian radicale (a1320 as adjective).
With use as adjective compare Middle French, French radical profound, intense, absolute (c1465), designating the humour or moisture once thought to be present in all living organisms as a necessary condition of their vitality (1516 in humide radical, 1587 in humeur radicale), relating to the root, of or from the root (1611), (in linguistics) relating to the root of a word (1660 in lettre radicale), (of a treatment) directed against the root or cause of a disease (1754 in cure radicale), (in mathematics) relating to or forming the root of a number or quantity (1762 in signe radical), advocating thorough or far-reaching political or social reforms (a1793). With use as noun compare French radical (in linguistics) root of a word (1754), (in chemistry) (1787: see below), (in mathematics) quantity that forms or is expressed as the root of another quantity (1798), person who advocates radical or far-reaching political or social reform, member of a political party or part of a party pursuing such aims (1820 with reference to politics in England, 1830 with reference to politics in France). Compare also Old Occitan radical (c1350 as adjective in humiditat radical), Catalan radical (14th cent. or earlier as adjective in humit radical), Spanish radical (c1418 as adjective in humidad radical), Portuguese radical (a1580 as adjective), Italian radicale (a1320 as adjective).
