1.NounCritical assessment of a process or activity or of their results.
"After you hand in your essays, I will give both grades and feedback."
2.NounThe part of an output signal that is looped back into the input to control or modify a system.
3.NounThe high-pitched howling noise heard when there is a loop between a microphone and a speaker.
4.VerbTo 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.
"The show ended with a riot of feedbacking guitars."
5.VerbTo provide informational feedback to.
"His employees feedbacked him a lot more than he wanted."
6.VerbTo convey by means of specialized communications channel.
"Customers feedbacked their complaints and some praise."