feedback

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feedback noun. ['fi:dbak] E20.
[from FEED verb1 + BACK adverb.]
The return of a fraction of the output signal from one stage of an electric circuit, amplifier, etc., to the input of the same or a preceding stage; the signal so returned. E20.
Biology, Psychology, etc. Modification or control of a process or system by its results or effects, esp. by the difference between a desired and actual result. M20.
Information about the result of an experiment, performance, etc.; response. M20.
Phrases: negative feedback feedback which tends to cause a decrease in the output signal, or, more widely, which tends to attenuate the effect of which it is part. positive feedback feedback which tends to cause an increase in the output signal, or, more widely, which tends to amplify the effect of which it is part.