One of the mysteries of the English language finally explained.
A great or profound mystery, especially the mystery of God or of existence; the overwhelming awe felt by a person contemplating such a mystery.
Mid 19th century. From post-classical Latin mysterium tremendum tremendous mystery from classical Latin mystērium + tremendum, neuter of tremendus.
mysterium tremendum/mɪˌstɪərɪəm trɪˈmɛndəm/
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