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Safin（讨论 | 贡献）2022年4月27日 (三) 08:31的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/feedback ref] From feed + back. == etymonline == [https://www.etymonline.com/word…”的新页面）
wiktionary
From feed + back.
etymonline
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.
