unitarian

noun

1. (alt-of)Alternative letter-case form of unitarian: any Christian who denies the doctrine of the Trinity.

   “But since Smith's ( of Norwich ) Bill passed , in 1813 , relieving Unitarians, as a religious sect, from the operation of the old law”

2. A follower of Unitarian Universalism or a similar non-credal religion that originated historically from Christian Unitarianism.

   “The Unitarians never kneel. But I want to kneel.”

3. (alt-of, rare)Alternative letter-case form of unitarian: any monotheist, particularly non-Christian monotheists (Muslims, Jews, etc.) as discussed from a Christian perspective.
4. A member of a political movement advocating a unitary state rather than a federal one, especially the Unitarios of nineteenth century Argentina (known as the Unitarian Party in English).
5. A Christian who denies the doctrine of the Trinity, usually stressing some distinctions between God the Father and God the Son without denying the divinity of Jesus.
6. Synonym of Muwahhid, a Muslim advocating God's strict unity.
7. (uncommon)Synonym of monotheist, a believer in the unity of God, particularly non-Christians (Muslims, Jews, etc.) discussed from a Christian perspective.
8. A person who rejects dualism in other contexts.

adj

1. Pertaining to Unitarianism.

   “It was no less than whether the psychic movement in Britain was destined to take a Unitarian or a Trinitarian course.”

2. Espousing a unitary view of something

   “the unitarian position on executive power”