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ho·moi·ou·si·an | \ hō-ˌmȯi-ˈü-zē-ən 
, hä-, -ˈü-sē- \
, hä-, -ˈü-sē- \Definition of homoiousian
: an adherent of an ecclesiastical party of the fourth century holding that the Son is essentially like the Father but not of the same substance
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Time Traveler for homoiousian
The first known use of homoiousian was in 1732
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