In the fourth-century Arian controversy, a person who held that God the Father and God the Son are of the same substance. Compare with homoiousian.
- The arguments between homoiousians and homoousians would be hysterically ridiculous if it weren't for the amount of blood shed over the letter ‘i’.
Mid 16th century: from ecclesiastical Latin homousianus, from homousius, from Greek homoousios, from homos 'same' + ousia 'essence, substance'.
Definition of homoousian in:
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