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English definition of “prison”

prison

noun uk   /ˈprɪz.ən/ us  
B1 [C or U] a building where criminals are forced to live as a punishment: Conditions in the prison are said to be appalling. He's spent a lot of time in prison. She went to/was sent to prison for six months. It was a maximum-security prison (= intended to be especially difficult to escape from). They should put him in prison and throw away the key! a prison cell/sentence/warder [U] the system of keeping people in prisons: the prison service Do you think prison works? Prison (= the time he had spent in prison) hadn't changed him at all. [C] a situation or relationship from which it is difficult to escape: She felt that her marriage had become a prison.
(Definition of prison from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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