Definitions for "Binitarianism"
The belief in two persons in the Godhead: God the Father and God the Son. A form of this doctrine was prevalent among the Greek apologists. It also exists today.
Binitarianism is a theology of two in one God, as opposed to one (unitarianism) or three (trinitarianism). Classically, it is understood as strict monotheism — that is, that God is an absolutely single being; and yet there is a "twoness" in God. At times, this monotheism drifted toward a "twoness" of God: that is, two Beings in one "God family" that is in agreement with itself, composed of the Father and the Son.