Any of several Christian doctrines of the second and third centuries ad that attempted to maintain monotheism and the unity of the Godhead, thereby denying the independent hypostasis of God the Son. Monarchianism was condemned as heretical by the Christian church in the fourth century.
The doctrine of several 2d- and 3d-cent. Christian sects that denied the Trinity altogether or denied the equality of the three persons of the Trinity.
Origin of monarchianism
From Latin Monarchiānī the Monarchians from monarchia monarchy monarchy