ἀρχιερεύς

chief priest, high priest, the high priests, these comprise in addition to one holding the high priestly office, both those who had previously discharged it and although disposed, continued to have great power in the State, as well as the members of the families from which high priest were created, provided that they had much influence in public affairs., Used of Christ because by undergoing a bloody death he offered himself as an expiatory sacrifice to God, and has entered into the heavenly sanctuary where he continually intercedes on our behalf.