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Hypostatic Union
The union of divine and human natures in the one Person of the Son — neither merged nor divided, genuinely one.
The hypostatic union is the definition of the Incarnation: the eternal Son assumed a complete human nature — body, rational soul, and will — uniting it to his divine nature in his single divine Person. Defined at Chalcedon (451 AD). The union is not a mixing of natures (Eutychianism) or a moral association of two persons (Nestorianism) but a genuine personal unity.