A Christian theological doctrine teaching that Christ possessed two distinct natures—one divine and one human—united in one person.
From Greek di- (two) + physis (nature) + -ism (doctrine). Developed as a response to monophysitism during major church councils in the 5th-7th centuries.
This doctrine was so controversial that entire branches of Christianity split over it—the Council of Chalcedon in 451 AD basically cleaved the church trying to settle whether Christ was one or two!
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