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What does the word radical mean?

Part of speech: noun

Radicalness.

Part of speech: noun

An extremist.

Part of speech: noun

The primitive part of a word; a root; radicle.

Part of speech: noun

A quantity of which the root is required.

Part of speech: adjective

Proceeding from or pertaining to the root; essential; fundamental.

Part of speech: adjective

Thoroughgoing; unsparing; extreme.

Usage examples for radical

This picture, although superficial and betraying when you looked into it a radical want of knowledge, was not lacking in charm. – Modern Painting by George Moore
Yet it would be difficult to perceive how they could have been less radical than they were. – A Political and Social History of Modern Europe V.1. by Carlton J. H. Hayes