'Unitarianism' definitions:

Definition of 'Unitarianism'

From: WordNet
noun
Christian doctrine that stresses individual freedom of belief and rejects the Trinity

Definition of 'Unitarianism'

From: GCIDE
  • Unitarianism \U`ni*ta"ri*an*ism\, n. [Cf. F. unitairianisme.] The doctrines of Unitarians. [1913 Webster]