Word Origin & History
mystery (1)
c.1315, in a theological sense, "religious truth via divine revelation, mystical presence of God," from Anglo-Fr. *misterie (O.Fr. mistere), from L. mysterium, from Gk. mysterion (usually in pl. mysteria) "secret rite or doctrine," from mystes "one who has been initiated," from myein "to close, shut," perhaps referring to the lips (in secrecy) or to the eyes (only initiates were allowed to see the sacred rites). The Gk. word was used in Septuagint for "secret counsel of God," translated in Vulgate as sacramentum. Non-theological use in English, "a hidden or secret thing," is from c.1300. In ref. to the ancient rites of Greece, Egypt, etc. it is attested from 1643. Meaning "detective story" first recorded in Eng. 1908.