Unitarians are Christians who reject the idea of the Trinity and believe that God is a single being.
They were Unitarians.
2. adjective
Unitarian means relating to the religious beliefs or practices of Unitarians.
...a Unitarian minister.
unitarian in British English
(ˌjuːnɪˈtɛərɪən)
noun
1.
a supporter of unity or centralization
adjective
2.
of or relating to unity or centralization
3. another word for unitary
Unitarian in British English
(ˌjuːnɪˈtɛərɪən)
noun
1. theology
a person who believes that God is one being and rejects the doctrine of the Trinity
2. ecclesiastical
an upholder of Unitarianism, esp a member of the Church (Unitarian Church) that embodies this system of belief
adjective
3.
of or relating to Unitarians or Unitarianism
Unitarian in American English
(ˌjunəˈtɛriən)
noun
1.
a person who denies the doctrine of the Trinity, accepting the moral teachings, but rejecting the divinity, of Jesus, and holding that God exists as one person or being
2.
a member of a denomination based on these beliefs and characterized by congregational autonomy, tolerance of differing religious views, absence of creed, etc.
: in full Unitarian Universalist
adjective
3.
of Unitarians or their doctrines, or adhering to Unitarianism
4. [u-]
unitary
Derived forms
Unitarianism (ˌUniˈtarianˌism)
noun
Word origin
< ModL unitarius, unitary + -an: also in part < unity + -arian