Definition of mysterium tremendum in US English:

mysterium tremendum

noun

  • A great or profound mystery, especially the mystery of God or of existence; the overwhelming awe felt by a person contemplating such a mystery.

Origin

Mid 19th century. From post-classical Latin mysterium tremendum tremendous mystery from classical Latin mystērium + tremendum, neuter of tremendus.

Pronunciation

mysterium tremendum

/mɪˌstɪərɪəm trɪˈmɛndəm/