In my Merriam-Webster Dictionary, the first definition of feedback is "the return to the input of a part of the output of a machine." Feedback in this sense is the squeal you hear when you get a microphone too close to a speaker. But if you follow the model of transactional analysis, this mechanical definition isn't all that out of line. In an interpersonal transaction, your employee gives you input in the form of effort. You provide feedback by returning output based on that input—that is, a response appropriate to that effort.
Feedback is defined by the Merriam-Webster Dictionary as 1) return to the input of a part of the output of a machine or system; 2) response about an activity or policy.
Now, all feedback ...