closed loop

Short definition from Wiktionary

Noun

1. 1
   A path whose initial point is equal to its terminal point.
2. 2
   Alternative form of closed curve.
3. 3
   A feedback loop, especially when found in: A closed-loop transfer function.
4. 4
   A feedback loop, especially when found in: An electronic feedback loop.
5. 5
   A feedback loop, especially when found in: A PID controller.
6. 6
   A closed ecological system.
7. 7
   Closed-loop communication.
8. 8
   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.
9. 9
   An economy in which materials are consistently reused rather than discharged as waste.
10. 10
    Clipping of closed time loop.
11. 11
    Alternative form of knot loop.