feed back (Noun) — Critical assessment or suggestions to improve performance. ex. "After you hand in your essays, I will give both grades and feedback"
feed back (Noun) — The process in which part of the output of a system is returned to its input in order to regulate its further output.
feed back (Noun) — Response to an inquiry or experiment.
feed back (Verb) — Submit (information) again to a program or automatic system.
feed back (Verb) — Respond to a query or outcome.