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.

If something is considered extremist or very different from anything that has come before it, call it radical.

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

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

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.

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 …

Definition of radical adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Jan 20, 2026 · radical (plural radicals) (historical, 19th-century Britain, politics) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short …

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