tritheism Meaning, Definition & Usage

  1. noun (Christianity) the heretical belief that the Father and the Son and the Holy Spirit are three separate gods

WordNet

Tri"the*ism noun
Etymology
Pref. tri- + Gr. God: cf. F. trithéisme.
Definitions
  1. The opinion or doctrine that the Father, Son, and Holy Spirit are three distinct Gods.

Webster 1913