radical

• adj.根本的な; 基本的な; 徹底的な
• n.基礎; ラジカル; [物質化された]原子団; [数]根

rad-、根、-ical、形容詞接尾辞。すなわち、根を持つ、派生的に急進的な、急進的な。

radical

radical: [14] Etymologically, radical means ‘of roots’. Its modern political meaning, based on the metaphor of fundamental change, going to the ‘roots’ of things, did not begin to emerge until the 18th century. The word was borrowed from late Latin rādīcālis, a derivative of Latin rādīx ‘root’ (source of English radish [OE] and probably related to root).
=> radish, ramify, root

radical (adj.)

late 14c., in a medieval philosophical sense, from Late Latin radicalis "of or having roots," from Latin radix (genitive radicis) "root" (see radish). Meaning "going to the origin, essential" is from 1650s. Radical sign in mathematics is from 1680s.

Political sense of "reformist" (via notion of "change from the roots") is first recorded 1802 (n.), 1817 (adj.), of the extreme section of the British Liberal party (radical reform had been a current phrase since 1786); meaning "unconventional" is from 1921. U.S. youth slang use is from 1983, from 1970s surfer slang meaning "at the limits of control." Radical chic is attested from 1970; popularized, if not coined, by Tom Wolfe. Radical empiricism coined 1897 by William James (see empiricism).

radical (n.)

1630s, "root part of a word, from radical (adj.) Political sense from 1802; chemical sense from 1816.

1. There will be a radical swing to the right or the left.

これにより極左または極右の場合があります。

2. Radical feminism is currently the fashionable topic among the chatering classes.

急進的フェミニズムは、現在の名口階層で話題になっている。

3.This thesis led to a radical reshaping of Labour policies.

この論文は労働党政策の抜本的な変化を招いた。

4.He remained for some years avowedly radical in his political outlook.

彼は長年公然と急進的な政治観を維持してきた。

5.The Conservative government will not slacken the pace of radical reform.

保守党政府は急進的な改革の歩みを緩めない。