Oxford Dictionary English

    high-security

    adjective
    adjective
    BrE BrE//ˌhaɪ sɪˈkjʊərəti//
    ; NAmE NAmE//ˌhaɪ səˈkjʊrəti//
    [only before noun] Prison
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  1. 1(of buildings and places) very carefully locked and guarded a high-security prison See related entries: Prison
  2. 2(of prisoners) kept in a prison that is very carefully locked and guarded
See high-security in the Oxford Advanced American Dictionary
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