Acacian

Of or relating to the Acacians.

Relating to a rift that occurred in the early 6th century, between the Eastern and Western Christian churches, occurring during the rule of Patriarch Acacius of Constantinople.

(historical) A follower of Acacius of Caesarea, a 4th-century moderate Arianist bishop whose followers signed the Nicene Creed but adopted a different theological understanding of it based on the Father merely resembling the Son.