Definition of high-security adjective from the Oxford Advanced American Dictionary

     

    high-security

     adjective
    adjective
     
    [only before noun]
     
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  1. 1(of buildings and places) very carefully locked and guarded a high-security prison
  2. 2(of prisoners) kept in a prison that is very carefully locked and guarded
See the Oxford Advanced Learner's Dictionary entry: high-security