'Unitarian' definitions:

Definition of 'Unitarian'

(from WordNet)
adjective
Of or relating to or characterizing Unitarianism
noun
Adherent of Unitarianism

Definition of 'Unitarian'

From: GCIDE
  • Unitarian \U`ni*ta"ri*an\, n. [Cf. F. unitaire, unitairien, NL. unitarius. See Unity.]
  • 1. (Theol.) 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. [1913 Webster]
  • 2. One who rejects the principle of dualism. [1913 Webster]
  • 3. A monotheist. [R.] --Fleming. [1913 Webster]

Definition of 'Unitarian'

From: GCIDE
  • Unitarian \U`ni*ta"ri*an\, a. Of or pertaining to Unitarians, or their doctrines. [1913 Webster]