The process in which part of the output of a system is returned to its input in order to regulate its further output WordNet 3.0 & Open English WordNet

Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop. Wikipedia

What occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop. Wikipedia Disambiguation

Process in which information about the past or the present influences the same phenomenon in the present or future; it occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop Wikidata

A process whereby some proportion of the output signal of a system is passed (fed back) to the input. This is often used to control the dynamic behavior of the system. OmegaWiki