'Tritheism' definitions:

Definition of 'tritheism'

From: WordNet
noun
(Christianity) the heretical belief that the Father and the Son and the Holy Spirit are three separate gods

Definition of 'Tritheism'

From: GCIDE
  • Tritheism \Tri"the*ism\, n. [Pref. tri- + Gr. ? God: cf. F. trith['e]isme.] The opinion or doctrine that the Father, Son, and Holy Spirit are three distinct Gods. [1913 Webster]