Radical | Mean of radical in English Dictionary

/ˈrædɪkəl/

• very new and different from what is traditional or ordinary
1. The computer has introduced radical innovations.
2. radical ideas about education
• very basic and important
1. There are some radical differences between the two proposals.
2. The new president has made some radical changes to the company.
3. radical reforms
• having extreme political or social views that are not shared by most people
1. radical liberals/conservatives
2. a radical wing of extremists

• very appealing or good
1. The party was totally radical! [=cool]
• Noun
• a person who favors extreme changes in government
1. He was a radical when he was young, but now he's much more moderate.