1. 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.
2. the portion of the output so returned.
3. sound created when a transducer such as a microphone or electric guitar picks up sound from a speaker connected to an amplifier and regenerates it back through the amplifier.
4. the return of information about the result of a process or activity; an evaluative response: asked the students for feedback on the new curriculum.
5. the process by which a system, often biological or ecological, is modulated, controlled, or changed by the product, output, or response it produces.

1. critical assessment on information produced
2. the signal that is looped back to control a system within itself.
3. the high-pitched howling noise heard when there's a loop between a microphone and a speaker.
4. to generate the high-frequency sound by allowing a speaker to cause vibration of the sound generator of a musical instrument connected by an amplifier to the speaker.
5. to provide informational feedback to.
6. to convey by means of specialized communications channel.

1. the process in which part of the output of a system is returned to its input.
2. response to an inquiry or experiment.

1. response to an inquiry or experiment
2. the process in which part of the output of a system is returned to its input in order to regulate its further output
3. submit (information) again to a program or automatic system
4. respond to a query or outcome