closed circuit noun 3closed-circuit adjective 1forms 1 noun3 •A circuit through which electrons can flow. •A network of one or more television cameras and television receivers connected together with no provision for broadcasting. •A complete electric circuit around which current can flow. closed-circuit adjective1 •That consists of a closed circuit.Holborn Underground Station, on London Transport's Piccadilly and Central Lines, has been equipped with closed-circuit television to help control passenger movement. — 1963 formsclosed circuits
