A Christian theological doctrine asserting that Christ had a single, unified divine nature rather than separate divine and human natures.
From Eutychian (based on Eutyches, a 5th-century Byzantine monk) + -ism, naming the religious movement based on his teachings.
Eutychianism was condemned as heresy in 451 CE at the Council of Chalcedon, yet churches influenced by it still exist today in Ethiopia and Armenia—a 1,500-year-old theological divide!
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