closed-circuit televisionBrE /ˌkləʊzd ˌsɜːkɪt ˈtelɪvɪʒn/ 🔊NAmE /ˌkloʊzd ˌsɜːrkɪt ˈtelɪvɪʒn/ 🔊 noun [uncountable] (abbreviation CCTV) a television system that works within a limited area, for example a public building, to protect it from crime 闭路电视