A word not found in Scripture, but used to express the doctrine of the unity of God as subsisting in three distinct Persons. This word is derived from the Greek trias, first used by Theophilus (A.D. 168-183), or from the Latin trinitas, first used by Tertullian (A.D. 220), to express this doctrine. The propositions involved in the doctrine are these: Return to Easton's Bible Dictionary | Trinity