fee-for-service [AS, feoh, property; L, servitum, slavery] , 1. a charge made for a professional activity, such as a physical examination, the fitting of a contraceptive diaphragm, or the monitoring of a person’s blood pressure. 2. a system for the payment of professional services in which the practitioner is paid for the particular service rendered, rather than receiving a salary for providing professional services as needed during scheduled hours of work or time on call.