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Definition of high-security adjective from the Oxford Advanced Learner's Dictionary

high-security

adjective
 
/ˌhaɪ sɪˈkjʊərəti/
 
/ˌhaɪ sɪˈkjʊrəti/
 [only before noun]
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  1. (of buildings and places) very carefully locked and guarded
    • a high-security prison
    Topics Crime and punishmentc1
  2. (of prisoners) kept in a prison that is very carefully locked and guarded
See high-security in the Oxford Advanced American Dictionary
Check pronunciation: high-security

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