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English Dictionary

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 closed circuit closed circuit /ˈkloʊzd ˈsɜːrkɪt/

noun

  1. () A complete electrical circuit around which current flows or a signal circulates  ( loop , closed circuit )
    a complete electrical circuit around which current flows or a signal circulates
     The surveillance cameras operate on a closed circuit, ensuring privacy.
    The surveillance cameras operate on a closed circuit, ensuring privacy.