closed loop

1. A path whose initial point is equal to its terminal point.

2. A feedback loop, especially when found in:

   A closed-loop transfer function.

3. An electronic feedback loop.

   a control system with a feedback loop that is active

4. A PID controller.

5. A closed ecological system.

6. Closed-loop communication.

7. The process of pulling water from one area of a reef aquarium and pumping it immediately elsewhere in the tank to create higher flow and minimize dead spots.

8. An economy in which materials are consistently reused rather than discharged as waste.

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