mystery

noun

1. 1

   Something secret or unexplainable; an unknown.

   “The truth behind the events remains a mystery.”

2. 2

   Someone or something with an obscure or puzzling nature.

   “That man is a mystery.”

3. 3

   A secret or mystical meaning.

4. 4

   A religious truth not understandable by the application of human reason alone (without divine aid).

5. 5

   (obsolete outside Eastern Orthodoxy) A sacrament.

6. 6

   (chiefly in plural) A secret religious celebration, admission to which was usually through initiation.

   “the Eleusinian mysteries”

7. 7

   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.”

8. 8

   A craft, art or trade; specifically a guild of craftsmen.