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1. Arising from or going to a root or source; basic: proposed a radical solution to the problem.
2. Departing markedly from the usual or customary; extreme or drastic: a radical change in diet.
3. Relating to or advocating fundamental or revolutionary changes in current practices, conditions, or institutions: radical politics; a radical political theorist.
4. Medicine Relating to or being surgery that is extreme or drastic in an effort to eradicate all existing or potential disease: radical hysterectomy.
5. Linguistics Of or being a root: a radical form.
6. Botany
a. Of, relating to, or arising from a root: radical hairs.
b. Arising from the base of a stem or from a below-ground stem or rhizome: radical leaves.
7. Slang Excellent; wonderful.
1. One who advocates fundamental or revolutionary changes in current practices, conditions, or institutions: radicals seeking to overthrow the social order.
2. Mathematics The root of a quantity as indicated by the radical sign.
3. Symbol R An atom or a group of atoms with one unpaired electron.
4. Linguistics See root1.
a. Any of the basic Chinese characters that are combined to form more complex characters.
b. Any of the traditional set of basic strokes or groups of strokes that make up Chinese characters and are used to classify and organize them in dictionaries.

[Middle English, of a root, from Late Latin rādīcālis, having roots, from Latin rādīx, rādīc-, root; see wrād- in Indo-European roots.]

rad′i·cal·ly adv.
rad′i·cal·ness n.
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References in periodicals archive ?
Mary refuses to speak aspirationally, and herein lies the most provocative proof of her radicalness, which Baron disavows.
The little magazine conveyed its radicalness as much, possibly more, through its form than through its content.
The Lushan Plenum was supposed to set the right track by correcting the problem of radicalness.
Knowledge acquisition asymmetries and innovation radicalness, Journal of Small Business Management 50(3): 447-468.
150) Some sort of similar rule, making execution the trigger for a statute of limitations, and hence requiring periodic re-execution of wills, would better suit the purpose of ensuring a will's evidentiary integrity, although such an innovation (its radicalness aside (151)) would add to the transaction cost of will making.
The radicalness of both the Panthers and Susan Griffin reflects not only the progressive push for freedom by the civil rights and feminist movements who were increasingly taking to the streets to protest discrimination, but also, and more specifically, an effort to understand and confront the forms of reaction that were threatening the ability to pursue the theoretical freedoms of the new economy.
Different businesses will have different product life cycles and different requirements with regard to frequency and radicalness of new products.
The radicalness of Skinner's thesis was especially appealing to behavior analysts who felt marginalized by mainstream psychology of the 1950s and 1960s.
According to him, the radicalness of the situation emerges from what he described as a dissolution of social bonds from the deep distrust in the legitimacy of institutions in Bulgaria.
Technology entrepreneurs' human capital and its effects on innovation radicalness, Entrepreneurship Theory and Practice, 31 (6), pp.
It is this radicalness of the modern atheist that emphasizes the connection between finitude and a resurrection of the body that is of the same origin and experience for all human bodies.