Subordinationism

Subordinationism is a Trinitarian doctrine wherein the Son (and sometimes also the Holy Spirit) is subordinate to the Father, not only in submission and role, but with actual ontological subordination to varying degrees. It posits a hierarchical ranking of the persons of the Trinity, implying ontological subordination of the persons of the Son and the Holy Spirit. It was condemned as heretical in the Second Council of Constantinople.

It is not to be confused with Arianism, as Subordinationism has been generally viewed as closer to the Nicene-Constantinopolitan view. While Arianism was developed out of it, it did not confess the personality of the Holy Spirit and the eternity of the Son.