feedback >> ˈfiːdbak
Definition: [noun] information about reactions to a product, a person's performance of a task, etc. which is used as a basis for improvement.
Example: throughout this process we have obtained valuable feedback
Definition: [noun] a screeching or humming sound resulting from the return of a fraction of the output signal from an amplifier, microphone, or other device to the input of the same device.
Example: Punk Rock Girl opens the disc with plenty of guitar feedback
Definition: [noun] the modification or control of a process or system by its results or effects, for example in a biochemical pathway or behavioural response.