Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “radical”

radical

noun [C]     /ˈrædɪkəl/
someone who supports the idea that there should be big social and political changesTaking action against people in powerActivism and pressure groups
(Definition of radical noun from the Cambridge Learner's Dictionary © Cambridge University Press)

More Learner's Dictionary definitions for “radical”

Definitions of “radical” in other dictionaries

Word of the Day

neighbourly

friendly or helpful

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More