Origin: Greek prefix bio-
Biofeedback has 2 different meanings across 1 category:
a training program in which a person is given information about physiological processes (heart rate or blood pressure) that is not normally available with the goal of gaining conscious control of them
A technique consisting of measuring a person's quantifiable bodily functions, such as blood pressure, heart rate, skin temperature, sweat gland activity, and muscle tension, then conveying the information to the person in real-time.