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
Origin 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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