|1.||a. the return of part of the output of an electronic circuit, device, or mechanical system to its input, so modifying its characteristics. In negative feedback a rise in output energy reduces the input energy; in positive feedback an increase in output energy reinforces the input energy|
|b. that part of the output signal fed back into the input|
|2.||the return of part of the sound output by a loudspeaker to the microphone or pick-up so that a high-pitched whistle is produced|
|3.||the whistling noise so produced|
|4.||a. the effect of the product of a biological pathway on the rate of an earlier step in that pathway|
|b. the substance or reaction causing such an effect, such as the release of a hormone in a biochemical pathway|
|5.||information in response to an inquiry, experiment, etc: there was little feedback from our questionnaire|
|6.||(tr) to return (part of the output of a system) to its input|
|7.||to offer or suggest (information, ideas, etc) in reaction to an inquiry, experiment, etc|
feedback feed·back (fēd'bāk')
The return of a portion of the output of a process or system to the input, especially when used to maintain performance or to control a system or process.
The portion of the output so returned.
The return of information about the result of a process or activity.
A process in which a system regulates itself by monitoring its own output. That is, it “feeds back” part of its output to itself. Feedback is used to control machines; a heating system, for example, uses a thermostat to monitor and adjust its output. Feedback is also used by the human brain to control various muscles and joints.
Note: By extension, “feedback” is any response or information about the result of a process.
Note: Feedback is usually a feature of automation.