A person who rejects the Christian doctrine of the Trinity, believing God is not three persons in one.
From anti- (against) + Trinitarian (believer in the Trinity), from Medieval Latin trinitas (threeness). Antitrinitarians emerged as a significant religious group in the 1500s-1600s during the Reformation.
Some of history's most brilliant scientists, like Isaac Newton, were secretly antitrinitarians at a time when this belief could get you executed—showing how even revolutionary thinkers had to hide their deepest convictions.
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