LATIN DICTIONARYLexicon Latīnum
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“mystery” in Latin

The English word mystery itself goes back to Latin mystērium.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

mystery
mysterium; arcanum; occultum; res occulta, recondita; secretum: (plur.) mysteries, mysteria, mysterorum, neuter (μυστήρια, the celebrated Grecian mysteries; ☞ never figuratively, for secrets, general term): silenda, silendorum, neuter (of a secret society, as the Free-masons; Vid: Liv., 39, 10, 5): To initiate into mysteries, mysteriis initiare: to celebrate mysteries, mysteria facere: that is a mystery to me (I do not understand it), haec non intelligo.

Quick answer

What is the Latin word for mystery?
The usual Latin words for “mystery” are mystērium, arcānus, occulō; also recondō, sēcernō, silendus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.