mystery

noun10

1. •
   something that nobody knows about or can explain

   • The truth behind the events remains a mystery.
2. •
   Someone or something with an obscure or puzzling nature.

   • That man is a mystery.
3. •
   A religious truth not understandable by the application of human reason alone (without divine aid).
4. •
   An account, story, book, film, or play, often with the theme of crime or murder, with a surprise ending that explains all the strange events that have occurred.
5. •
   [in the plural] A secret religious celebration, admission to which was usually through initiation.

   • There’s no initiation either into such mysteries. — 1899
6. •
   A particular event or series of events in the life of Christ.

   • The second decade of the Rosary concerns the Sorrowful mysteries, such as the crucifixion and the crowning with thorns.
7. •
   A mystery play.

   • The Moralities displayed something more of art and invention than the Mysteries; in them virtues, vices and qualities were personified, and something like a plot was frequently to be discovered. — 1862
8. •
   A sacrament.

   • There are seven mysteries, or sacraments, in the Greek church, viz. baptism, the chrism (a rite peculiar to this church), the eucharist, confession, ordination, marriage, and the holy oil. — 1809
9. •
   (no longer used) A secret or mystical meaning.

   • […] and, not knowing the meaning or misterie of her pollicie, forgat no termes of reproche or rigorous rebuke against his chast doughter. — 1567
10. •
    (no longer used) A craft, art or trade; specifically a guild of craftsmen.

    • The trades, the crafts, the mysteries, would all be losers. — 1776