Miaphysitism

Miaphysitism () is the Christological doctrine that holds Jesus, the Incarnate Word, is fully divine and fully human, in one nature or physis (). It is the position held by the Oriental Orthodox Churches. It differs from the dyophysitism of the Catholic Church, Eastern Orthodox Church, the Church of the East and major Protestant denominations, which holds that Jesus is one person with two natures (divine and human) as defined by the Council of Chalcedon in 451.

While historically a major point of controversy within Christianity, some modern declarations by both Chalcedonian and Miaphysite churches claim that the difference between the two Christological formulations does not reflect any significant difference in belief about the nature of Christ. Other statements from both Chalcedonian and Miaphysite churches claim that such difference is indeed theological but has been "widened by non-theological factors".