One of the mysteries of the English language finally explained.
A person initiated into mysteries, especially religious mysteries.
Late 17th century; earliest use found in Joseph Glanvill (1636–1680), Church of England clergyman. From classical Latin mystēs or its etymon ancient Greek μύστης initiate from the base of μύειν to close + -της, suffix forming agent nouns; the primary sense is probably ‘person vowed to keep silence’. Compare ancient Greek μυεῖν to initiate into mysteries.
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