definition
One of the Semi-Arians of the 4th century who held that the Son was of like, but not the same, essence or substance with the Father.
definition
Having a similar but not identical essence, especially with reference to the first and second persons of the Trinity
At the first synod of Sirmium he won a dialectic victory over the homoiousian bishops, Basilius and Eustathius, who sought in consequence to stir up against him the enmity of Caesar Gallus.
His theological attitude was that known as semiArian or Homoiousian, and his associates were Eustathius of Sebaste and Basil of Ancyra.
Macedonius, who defended the semi-Arian or Homoiousian position that the Spirit was merely a Divine in Spirit.
Loofs describe them as belonging to the Homoiousian party - believers in the Son's " likeness of essence " to the Father's, not " identity of essence."