Eastern Orthodox are Chalcedonic and accepts 7 ecumenical councils while Oriental Orthodox are Anti-Chalcedonic and accepts the first 3 ecumenical councils. or in short definition, Oriental Orthodox are Miaphysitist (ተዋሕዶ) and Eastern Orthodox are diaphysitist (የተነጣጠለ ባሕርየ መለኮት) believers.