/ ˈmɪstɪk; NAmE / noun
a person who tries to become united with God through prayer and meditation and so understand important things that are beyond normal human understanding
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WORD ORIGIN
Middle English (in the sense mystical meaning ): from Old French mystique , or via Latin from Greek mustikos , from mustēs initiated person from muein close the eyes or lips, also initiate. The current sense of the noun dates from the late 17th cent.