Unitarian
From BiblePortal Wikipedia
Unitarian [1]
(1):
(a.) Of or pertaining to Unitarians, or their doctrines.
(2):
(n.) A monotheist.
(3):
(n.) One who rejects the principle of dualism.
(4):
(n.) One who denies the doctrine of the Trinity, believing that God exists only in one person; a unipersonalist; also, one of a denomination of Christians holding this belief.