One of the mysteries of the English language finally explained.
In the fourth-century Arian controversy, a person who held that God the Father and God the Son are of like but not identical substance.Compare with homoousian
- ‘The arguments between the homoiousian and homoousians would be hysterically ridiculous if it weren't for the amount of blood shed over the letter ‘i’.’
- ‘Constantius at first supported these homoiousians but soon transferred his support to the homoousians, led by Acacius, who affirmed that the Son was ‘like’ the Father.’
- ‘In the Council of Nicaea, for instance, the bishops had to choose between homoousian and homoiousian to describe Jesus' nature: Is He of ‘one’ substance with the Father, or is He of ‘like’ substance to the Father?’
- ‘The Arian controversy was a Christological dispute that began in Alexandria between the followers of Arius, the Arians; the followers of St. Alexander of Alexandria, known as homoousians; and a third group, known as homoiousians.’
- ‘In 381, the Council of Constantinople reaffirmed the credo of Nicaea and condemned the semi-Arians, the homoiousians.’
Late 17th century (as an adjective in the sense ‘of similar but not identical substance’): via ecclesiastical Latin from Greek homoiousios, from homoios ‘like’ + ousia ‘essence, substance’. The noun dates from the mid 18th century.
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