unitarian

[yoo-ni-tair-ee-uh n] /ˌyu nɪˈtɛər i ən/
noun
1.
a person who maintains that God is one being, rejecting the doctrine of the Trinity.
2.
(initial capital letter) a member of a liberal religious denomination founded upon the doctrine that God is one being, and giving each congregation complete control over its affairs.
Compare Unitarian Universalism.
3.
an advocate of unity or centralization, as in government.
adjective
4.
(initial capital letter) pertaining to the Unitarians or their doctrines; accepting Unitarianism; belonging to the Unitarians.
5.
unitary.
Origin
1680-90; < Neo-Latin ūnitāri(us) (Latin ūnit(ās) unity + -ārius -ary) + -an
Related forms
nonunitarian, noun
non-Unitarian, adjective, noun
pro-Unitarian, adjective, noun
British Dictionary definitions for unitarian

unitarian

/ˌjuːnɪˈtɛərɪən/
noun
1.
a supporter of unity or centralization
adjective
2.
of or relating to unity or centralization
3.
another word for unitary

Unitarian

/ˌjuːnɪˈtɛərɪən/
noun
1.
(theol) a person who believes that God is one being and rejects the doctrine of the Trinity
2.
(ecclesiast) 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
Word Origin and History for unitarian
n.

1680s, "one who rejects the doctrine of the Trinity," from Modern Latin unitarius (1650s), from Latin unitas (see unity) + -ian.