Dictionary
3 ENTRIES FOUND:

closed–circuit

adjective closed–cir·cuit \-ˈsər-kət\

—used to describe a television system that sends its signal through wires to a limited number of televisions

Full Definition of CLOSED-CIRCUIT

:  used in, shown on, or being a television installation in which the signal is transmitted by wire to a limited number of receivers

First Known Use of CLOSED-CIRCUIT

1949

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