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ho·mo·ou·si·an | \ hō-ˌmō-ˈü-zē-ən 
, hä-, -ˈü-sē- \
, hä-, -ˈü-sē- \Definition of homoousian
: an adherent of an ecclesiastical party of the fourth century holding to the doctrine of the Nicene Creed that the Son is of the same substance with the Father
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The first known use of homoousian was in 1565
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