In Christian theology, the incarnation is the belief that Jesus Christ, the second person of the Trinity, also known as God the Son or the Logos (Koine Greek for "word"), "was made flesh" by being conceived in the womb of a woman, the Virgin Mary, also known as the Theotokos (Greek for "God-bearer"). The doctrine of the incarnation, then, entails that Jesus is fully God and fully human.
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In the incarnation, as traditionally defined by those Churches that adhere to the Council of Chalcedon, the divine nature of the Son was united but not mixed with human nature in one divine person, Jesus, who was both "truly God and truly man". This is central to the traditional faith held by most Christians. Alternative views on the subject (see Ebionites and the Gospel of the Hebrews) have been proposed throughout the centuries, but all were rejected by Nicene Christianity.
The incarnation is commemorated and celebrated each year at Christmas, and also reference can be made to the Feast of the Annunciation; "different aspects of the mystery of the incarnation" are celebrated at Christmas and the Annunciation.