Definition of young offender institution noun from the Oxford Advanced Learner's Dictionary

 

young offender institution

 noun
noun
BrE
 
; NAmE
 
 
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a type of prison in Britain for young people who have committed crimes. Young offender institutions contain people aged 15–17 who have been found guilty in youth courts and people aged 18–20 who have been found guilty in ordinary courts for adults. They were formerly called Borstals.