from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The belief that God is composed of four persons
from The Century Dictionary and Cyclopedia
- n. In theology, the doctrine that in the Godhead there are, in addition to the Divine Essence, three persons or individualizations—the Father, the Son, and the Holy Spirit—making in the Godhead three and one instead of three in one.
tetra- + theism (Wiktionary)