Monarchianism

noun

Mo·​nar·​chi·​an·​ism -ēəˌnizəm 

plural -s

: an anti-Trinitarian doctrine or theory current in the Christian church of the 2d and 3d centuries a.d. in several forms and having as a common principle a belief that God is a single person as well as a single being see dynamic monarchianism , modalistic monarchianism compare patripassianism

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