Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Late Latin
Origin: radicalis, from Latin radix 'root'

radical

1 adjective
     
Related topics: Policies
rad‧i‧cal1 W3
1

change/difference

a radical change or difference is very big and important:
They are proposing radical changes to the way the company is run.
a radical reform of the tax system
There are radical differences between the two organizations.
2

opinions

PPP radical ideas are very new and different, and are against what most people think or believe [↪ conservative]:
He has put forward some very radical ideas.
I was shocked by her radical views.
a radical approach to education
3

people

someone who is radical has ideas that are very new and different, and against what most people think or believe:
a radical left-wing politician
a radical feminist
4

good

American English informal very good or enjoyable:
That was one radical party last night!
radically adverb:
a radically different method of production
a radically new approach to the problem

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