Meaning of “radical” in the English Dictionary

"radical" in English

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radicaladjective

uk /ˈræd.ɪ.kəl/ us /ˈræd.ɪ.kəl/

radical adjective (SUPPORTING CHANGE)

C2 believing or expressing the belief that there should be great or extreme social or political change:

He was known as a radical reformer/thinker/politician.
These people have very radical views.

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radical adjective (VERY IMPORTANT)

C1 relating to the most important parts of something or someone; complete or extreme:

We need to make some radical changes to our operating procedures.
I'm just having my hair trimmed - nothing radical.

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radically
adverb uk /ˈræd.ɪ.kəl.i/ us /ˈræd.ɪ.kəl.i/

C1

Barker introduced some radically new ideas.

radicalnoun [ C ]

uk /ˈræd.ɪ.kəl/ us /ˈræd.ɪ.kəl/
radicalism
noun [ U ] uk /ˈræd.ɪ.kəl.ɪ.zəm/ us /ˈræd.ɪ.kəl.ɪ.zəm/

(Definition of “radical” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"radical" in American English

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radicaladjective

us /ˈræd·ɪ·kəl/

radical adjective (SUPPORTING CHANGE)

believing or expressing the belief that there should be great or extreme social, economic, or political change:

White’s political orientation was decidedly liberal, but hardly radical.

radical adjective (EXTREME)

causing or being an example of great change; extreme:

During bad economic times, radical steps may be necessary to restore the confidence of the consumer.
radically
adverb us /ˈræd·ɪ·kli/

Her views are not radically different from my own.

radicalnoun [ C ]

us /ˈræd·ɪ·kəl/

radical noun [ C ] (SUPPORTING CHANGE)

(Definition of “radical” from the Cambridge Academic Content Dictionary © Cambridge University Press)

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radical

Unless we can think of something radical, there is a danger that we too will have to recognise the hopelessness of the situation.
The outdated social model so beloved of the left is to be replaced with a vigorous, dynamic and radical reform programme.
Incorrect and hasty preparations have created a situation in which the moderate advocates of disclosure are voting in favour and the radical advocates are being forced to vote against.
Examples of this are the migration flows in our direction, the deterioration of our environment and the dangers presented to our society by radical fundamentalism.
I am sorry to say that we do not agree with the majority of the rapporteur' s amendments because he is using them to emphasise a radical and one-sided position.
We believe, however, that agricultural policy is in need of radical reform and we should therefore have preferred there to have been further reductions.
We had the impression that the politicians were falling over themselves with radical demands and instructions, but none of them offered a particularly effective response to the outbreaks.
In this context, there is a need for a radical change to the legislation governing international shipping and a review of the old conventions that do not include these principles.
Although when we look at the situation realistically it is not, on the whole, a dramatic one, nevertheless the resources for implementing the strategy require radical rethinking.
I am entirely convinced that there will be no fundamental improvement in the security situation without a more radical and a more rapid transfer of powers.