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Wiktionary
closed circuit

n. 1 A circuit through which electrons can flow. 2 A complete electric circuit around which current can flow. 3 A network of one or more television cameras and television receivers connected together with no provision for broadcasting.

WordNet
closed circuit

n. a complete electrical circuit around which current flows or a signal circulates [syn: loop] [ant: open circuit]

Wikipedia
Closed Circuit (1978 film)

Closed Circuit is a 1978 Italian crime film directed by Giuliano Montaldo. It was entered into the 28th Berlin International Film Festival.

Closed Circuit (album)

Closed Circuit is the sixth and final album by New Zealand composer Peter Jefferies, released on October 23, 2001 through Emperor Jones.

Closed Circuit (2013 film)

Closed Circuit is a 2013 British-American political thriller drama film directed by John Crowley and written by Steven Knight, released on August 28, 2013. The film stars Eric Bana, Rebecca Hall, CiarĂ¡n Hinds, Jim Broadbent, and Riz Ahmed.

Usage examples of "closed circuit".

I unbuckled the straps behind my neck and pulled off the closed circuit breathing apparatus.