词典释义：
(especially of change or action)relating to or affecting the fundamental nature of something: far-reaching or thorough
（尤指变化或行动）根本的；意义深远的，彻底的
-
a radical overhaul of the existing regulatory framework .对现有管理体制的彻底检查。
forming an inherent or fundamental part of the nature of someone or something
（人，物）原本的，固有的，与生俱来的
-
the assumption of radical differences between the mental attributes of literate and non-literate peoples .就有文字民族与无文字民族之间智力特征固有差异的假设。
(of surgery or medical treatment)thorough and intended to be completely curative
（外科，医疗）根治的，根除的。
characterized by departure from tradition: innovative or progressive
反传统的；创新的，革新的；进步的
-
the city is known for its radical approach to transport policy. 该市以交通政策方面的革新而著称。
advocating thorough or complete political or social reform: representing or supporting an extreme or progressive section of a political party
过激的；激进的，激进派的
-
a radical American activist .美国激进主义分子。
(of a measure or policy)following or based on such principles
（措施，政策）彻底革新的；激进性的。
〈英，史〉 （１９世纪）自由党激进派的。
of or relating to the root of something, in particular
（与）根（有关）的，尤指：
【数】 根式的；根号的；根基的。
denoting or relating to the roots of a word
词根的。
【乐】 根音。
【植】 根生的。
[usu. as exclamation]
〈非 正式，主美〉 顶刮刮的
-
Okay, then. Seven o'clock. Radical! 好吧。七点钟。太棒了！
a person who advocates thorough or complete political or social reform: a member of a political party or part of a party pursuing such aims
过激主义者；激进主义者；激进党派成员。
【化】 基，根，原子团。参见<Bold>FREE RADICAL</Bold>.[ORIGIN: early 19th cent.: from French.]
the root or base form of a word
词根。
any of the basic set of approximately 214 Chinese characters constituting semantically or functionally significant elements in the composition of other characters and used as a means of classifying characters in dictionaries
（汉字）偏旁，部首。
【数】 根式；根基。
a radical sign
根号。
-
radicaladj.根本的；意义深远的；彻底的；过激的；激进的；激进派的；根的；顶刮刮的；创新的
-
radioactiveadj.放射性的；放射性引起的
"late Middle English （in the senses forming the root and inherent）： from late Latin
