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Definition radical in British English

radical noun

[countable] noun
/ˈrædɪk(ə)l/
1

someone who believes that important political or social changes are necessary

Example

a group of young radicals within the party

Synonyms and related words
2

a group of atoms that are part of a molecule and do not change as a result of a chemical reaction

Synonyms and related words
Definition radical in British English