(n.) A trade; a handicraft; hence, any business with which one is usually occupied.
(a.) A kind of secret religious celebration, to which none were admitted except those who had been initiated by certain preparatory ceremonies; - usually plural; as, the Eleusinian mysteries.
(a.) A profound secret; something wholly unknown, or something kept cautiously concealed, and therefore exciting curiosity or wonder; something which has not been or can not be explained; hence, specifically, that which is beyond human comprehension.
(n.) A dramatic representation of a Scriptural subject, often some event in the life of Christ; a dramatic composition of this character; as, the Chester Mysteries, consisting of dramas acted by various craft associations in that city in the early part of the 14th century.
(a.) Anything artfully made difficult; an enigma.
(a.) The consecrated elements in the eucharist.
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Webster, Noah. Entry for 'Mystery'. Noah Webster's American Dictionary. http://www.studylight.org/dictionaries/web/m/mystery.html. 1828.