closed-circuit television

noun

1. a system of televising by cable to designated viewing sets, as within a factory for monitoring production operations, in a theater for viewing a special event taking place elsewhere, or in an office building as an aid to maintaining security.

closed-circuit television

noun

1. a television system in which signals are transmitted from a television camera to the receivers by cables or telephone links forming a closed circuit, as used in security systems, etc

Word History and Origins

Origin of closed-circuit television¹

First recorded in 1945–50