Monarchian

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Mon·ar·chi·an·ism

M0381000 (mə-när′kē-ə-nĭz′əm)n. 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.
[From Latin Monarchiānī, the Monarchians, from monarchia, monarchy; see monarchy.]
Mo·nar′chi·an n.