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top-security

adjective [before noun]
 
 
/ˌtɒp.sɪˈkjʊə.rɪ.ti/ US  /ˌtɑːp.sɪˈkjʊr.ə.t̬i/

Definition

a top-security prison or hospital is very strongly protected because it contains dangerous peoplePrisons and parts of prisons
(Definition of top-security adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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