What is the teaching that the Virgin Mary is the "mother/bearer of God" called?

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The teaching that the Virgin Mary is the "mother/bearer of God" is called Theotokos, which comes from the Greek words "theos" meaning God and "tokos" meaning bear or give birth to. This title affirms that Mary is the mother of Jesus Christ who is fully God and fully human. It was adopted as an official teaching at the Council of Ephesus in 431 AD. The teaching that the Virgin Mary is the "mother/bearer of God" is called Theotokos, which translates to "God-bearer" in Greek. It was a term that was officially adopted by the Council of Ephesus in 431 AD to affirm that Jesus Christ was both fully human and fully divine, and that Mary bore and gave birth to the divine person of Jesus.

What Is the Teaching That the Virgin Mary Is the "Mother/bearer