- The definition of closed circuit is a system where video or other media is transmitted through connected cables and wires, not through the air.
When you have a video camera directly connected to a TV on the property that shows images from the video camera, this is an example of a closed-circuit TV.
- Closed circuit means a complete electrical connection around which current flows or circulates.
When you have a series of electrical wires connecting to each other and completing a circuit so that current travels from one end of the circle to the other, this is an example of a closed circuit.
- An electric circuit providing an uninterrupted, endless path for the flow of current.
- A television transmission circuit with a limited number of reception stations and no broadcast facilities.
(plural closed circuits)