noun.
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noun.
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.
noun.
The portion of the output so returned.
noun.
Sound created when a transducer, such as a microphone or the pickup of an electric guitar, picks up sound from a speaker connected to an amplifier and regenerates it back through the amplifier.
noun.
The return of information about the result of a process or activity; evaluative response.
noun.
The process by which a system, often biological or ecological, is modulated, controlled, or changed by the product, output, or response it produces.