closed-circuit
adjectiveUK /ˌkləʊzd ˈsɜː.kɪt/
US /ˌkloʊzd ˈsɝː.kɪt/
A closed circuit is a path that lets electricity flow in a full loop.
The bulb lit up because the wires made a closed circuit.
RELATED WORDS
OTHER MEANINGS
2. A television system where the signal is sent only to certain screens, not broadcast to everyone.
The school uses closed-circuit cameras to watch the hallways.
3. A system or setup that works within its own group and does not connect to the outside.
The factory runs a closed-circuit water system that reuses the same water.
4. A breathing device that recycles the air a diver breathes instead of releasing it.
The diver used a closed-circuit rebreather to stay underwater longer.