The meaning of RADICAL is of, relating to, or proceeding from a root. How to use radical in a sentence.

RADICAL definition: 1. believing or expressing the belief that there should be great or extreme social or political…. Learn more.

Relating to or advocating fundamental or revolutionary changes in current practices, conditions, or institutions: radical politics; a radical political theorist.

An individual atom or element as a constituent of a compound was formerly termed a simple radical, as distinct from a group or compound radical. The use of the word for single atoms is now unusual …

a person holding radical views, esp. one favoring fundamental social or economic change

The radical symbol, also known as the square root symbol, is used in math to represent the square root operator and to represent taking the nth-root of an expression.

Radical (chemistry), an atom, molecule, or ion with unpaired valence electron (s) Radical surgery, where diseased tissue or lymph nodes are removed from a diseased organ

Jan 20, 2026 · Adjective [edit] radical (comparative more radical, superlative most radical) Favoring fundamental change, or change at the root cause of a matter.

The indicated root of a quantity or quantities, shown by an expression written under the radical sign.

In chemistry, a radical is an atom, molecule, or ion that has unpaired valence electrons or an open electron shell, and therefore may be seen as having one or more "dangling" covalent bonds.