The belief in a single God, not divided into any aspects, particularly when presented as a contrast to Christian trinitarianism.

The religious belief that God is a single Person.

(beginning in 1961) The religion known as Unitarian Universalism

plural of unitarianism

A Christian who does not believe in the traditional doctrine of the Trinity.

Pertaining to Unitarianism.

plural of Unitarian

Espousing a unitary view of something

One who denies the doctrine of the Trinity, believing that God exists only in one person; a unipersonalist. / (Islam) A Muwahhid. / One who rejects the principle of dualism. / A monotheist.

Third-person singular simple present indicative form of unitarianize