Trinitarianism
noun
the belief in, or doctrine of, the Trinity, the threefold personality of the Christian God.
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As early as 1531, long before the rise of the Socinians, the Spaniard Servetus taught anti-Trinitarianism, and continued to do it for more than twenty years.
From Lectures on Modern history by John Emerich Edward Dalberg Acton, Baron Acton