Etymology
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feedback (n.)

1920, in the electronics sense, "the return of a fraction of an output signal to the input of an earlier stage," from verbal phrase, from feed (v.) + back (adv.). Transferred use, "information about the results of a process" is attested by 1955.

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Definitions of feedback

feedback (n.)
the process in which part of the output of a system is returned to its input in order to regulate its further output;
feedback (n.)
response to an inquiry or experiment;
From wordnet.princeton.edu