1. 
   closed circuit
   [n] - a complete electrical circuit around which current flows or a signal circulates
   Found op http://www.webdictionary.co.uk/definition.php?query=closed%20circuit
   
   
2. 
   closed circuit
   noun a complete electrical circuit around which current flows or a signal circulates
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=closed%20circuit
   
   
3. 
   closed circuit
   for a given terminal pair, electric circuit with a continuous path between the two terminals of the pair
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-12-72
   
   
4. 
   closed circuit
   a circuit for testing, rehearsal or recording of programmes or for other purposes, solely for use within the production centre
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=723-02-30
   
   
5. 
   Closed Circuit
   [film] Closed Circuit (Circuito chiuso) is a 1978 Italian crime film directed by Giuliano Montaldo. It was entered into the 28th Berlin International Film Festival. ...
   Found op http://en.wikipedia.org/wiki/Closed_Circuit_(film)
   
   
6. 
   closed-circuit
   [adj] - relating to or consisting of a closed circuit
   Found op http://www.webdictionary.co.uk/definition.php?query=closed-circuit
   
   
7. 
   closed-circuit
   adjective relating to or consisting of a closed circuit; `closed-circuit television`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=closed-circuit
   
   

Tip: double click on a word to show its meaning.