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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Origin and Etymology of homoiousian
Late Greek homoiousios of like substance, from Greek homoi- homeo- + ousia essence, substance, from ont-, ōn, present participle of einai to be — more at is
First Known Use: 1732
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Britannica.com: Encyclopedia article about homoiousian
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