unitarian

UK: /ˌjuːnɪˈtɛərɪən/ US: (yo̅o̅′ni târ′ē ən)

WordReference Random House Unabridged Dictionary of American English © 2025

u•ni•tar•i•an  (yo̅o̅′ni târ′ē ən), n. 

1. a person who maintains that God is one being, rejecting the doctrine of the Trinity.
2. (cap.) 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. Cf. Unitarian Universalism. 
3. an advocate of unity or centralization, as in government.

adj. 

4. (cap.) pertaining to the Unitarians or their doctrines;
   accepting Unitarianism;
   belonging to the Unitarians.
5. unitary.

• Neo-Latin ūnitāri(us) (Latin ūnit(ās) unity + -ārius -ary) + -an
• 1680–90

Collins Concise English Dictionary © HarperCollins Publishers::

unitarian / ˌjuːnɪˈtɛərɪən/ noun

1. a supporter of unity or centralization

adjective

1. of or relating to unity or centralization
2. another word for unitary

Collins Concise English Dictionary © HarperCollins Publishers::

Unitarian / ˌjuːnɪˈtɛərɪən/ noun

1. a person who believes that God is one being and rejects the doctrine of the Trinity
2. an upholder of Unitarianism, esp a member of the Church (Unitarian Church) that embodies this system of belief

adjective

1. of or relating to Unitarians or Unitarianism