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British Dictionary definitions for open prison

open prison

noun
  1. a penal establishment in which the prisoners are trusted to serve their sentences and so do not need to be locked up, thus extending the range of work and occupation they can safely undertake
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012