Incarnation: "Literally, 'enfleshment' or 'embodiment.' In Christian theology this term refers to the act whereby God became human in the person of Jesus of Nazareth. The incarnation is logically tied to the doctrine of the Trinity, as it is God the Son—the second person of the Trinity—who 'emptied himself' and became human. The incarnation received a classical formulation at the Council of Chalcedon (451), which said that in becoming human God the Son remained 'one person' but had 'two natures' (divine and human)."
Evans, C. (2002) Pocket Dictionary of Apologetics & Philosophy of Religion. Downers Grove, IL: InterVarsity Press.