mystery

¹ American  

[mis-tuh-ree, -tree] / ˈmɪs tə ri, -tri /

noun

• mysteries
  plural

1. anything that is kept secret or remains unexplained or unknown.

   the mysteries of nature.

2. any affair, thing, or person that presents features or qualities so obscure as to arouse curiosity or speculation.

   The masked guest is an absolute mystery to everyone.

3. a novel, short story, play, or film whose plot involves a crime or other event that remains puzzlingly unsettled until the very end.

   a mystery by Agatha Christie.

4. obscure, puzzling, or mysterious quality or character.

   the mystery of Mona Lisa's smile.

   Synonyms:

   secrecy, mystique, obscurity, ambiguity, riddle, secret, problem, puzzle, enigma

5. any truth that is unknowable except by divine revelation.

6. (in the Christian religion)

   1. a sacramental rite.

   2. Eucharist.

7. an incident or scene in connection with the life of Christ, regarded as of special significance.

   the mysteries of the Passion.

8. any of the 15 events in the lives of Christ and the Virgin Mary meditated upon during the recitation of the rosary.

9. mysteries,

   1. ancient religions that admitted candidates by secret rites and rituals the meaning of which was known only to initiated worshipers.

   2. any rites or secrets known only to those initiated.

      the mysteries of Freemasonry.

   3. (in the Christian religion) the Eucharistic elements.

10. mystery play.

---

mystery ² American  

[mis-tuh-ree] / ˈmɪs tə ri /

noun

Archaic.

• mysteries
  plural

1. a craft or trade.

2. a guild, as of merchants.

---

mystery ¹ British  

/ ˈmɪstərɪ, -trɪ /

noun

1. an unexplained or inexplicable event, phenomenon, etc

2. a person or thing that arouses curiosity or suspense because of an unknown, obscure, or enigmatic quality

3. the state or quality of being obscure, inexplicable, or enigmatic

4. a story, film, etc, which arouses suspense and curiosity because of facts concealed

5. Christianity any truth that is divinely revealed but otherwise unknowable

6. Christianity a sacramental rite, such as the Eucharist, or ( when plural ) the consecrated elements of the Eucharist

7. (often plural) any of various rites of certain ancient Mediterranean religions

8. short for mystery play

---

mystery ² British  

/ ˈmɪstərɪ /

noun

1. a trade, occupation, or craft

2. a guild of craftsmen

---

Other Word Forms

Noun Inflected Forms

• mysteries
  plural

---

Etymology

Origin of mystery¹

First recorded in 1275–1325; Middle English misteri(e), from Latin mystērium “a secret,” (plural) mystēria “secret rites,” from Greek mystḗrion, equivalent to mýs(tēs) “an initiate (into the Eleusinian mysteries)” + -tērion noun suffix; see also mystic)

Origin of mystery²

First recorded in 1350–1400; Middle English misteri(e) “ministry, office; handicraft, art; guild” from Old French mistere and Medieval Latin misterium, variant of Latin ministerium ministry, confused with mystērium mystery ¹ ( def. )

---

Explanation

A mystery is something that baffles our understanding and cannot be explained. The giant slabs of Stonehenge, remain a mystery to this day. The noun mystery comes from the Greek mysterion, meaning "secret rite or doctrine." A great synonym for secret is enigma. We use this word all the time to describe stuff we don't understand, from crop circles and UFOs to the origins of the universe and the workings of the human brain. In literature, drama, and film, a mystery is a story that centers around a crime, usually murder, which finally gets solved at the very end.

Example Sentences

See Examples For:

mystery mysteries

The paper says the "near-misses" took place just days apart, and the mystery objects were spotted at 17,000ft - which it notes is more than 40 times the legal height limit for commercial drones.

From BBC ● Oct. 16, 2026

Rafael will also reveal a connection to Lorca that, within the overarching narrative, drives a literary mystery relating to the unfinished play.

From The Wall Street Journal ● Oct. 15, 2026

There was never any genuine mystery about his whereabouts.

From Salon ● Oct. 15, 2026

A major opportunity to investigate this mystery arrived in 2024, when Chang'e-6 became the first mission to return samples from the Moon's far side.

From Science Daily ● Oct. 14, 2026

“The wolves were a reminder that the strange curse upon the Ashtons was a mystery bigger than mere reason could overrule.”

From "The Long-Lost Home" by Maryrose Wood

One of the biggest mysteries the researchers wanted to explain was why black holes do not always launch jets at the same time.

From Science Daily ● Oct. 16, 2026

In their rookie days, he recalls, “Carson and I had this ongoing discussion: How do crimes get solved? Or real mysteries for that matter. By the book, by accretion of information—logically?”

From The Wall Street Journal ● Oct. 7, 2026

Nobel Prize-winning American researcher Karl Deisseroth is a psychiatrist, neuroscientist and bioengineer who has spent more than two decades illuminating the workings of the brain to unlock its mysteries.

From Barron's ● Oct. 6, 2026

Contemplate life’s mysteries: The Explainer was a longtime Slate column that answered readers’ burning questions about the world.

From Slate ● Oct. 2, 2026

But when she first saw the plane that night, she wasn’t thinking about mysteries or secrets.

From "Found" by Margaret Peterson Haddix

Random Word

Spin the wheel and learn a new word!

---

Related Words

• conundrum
• enigma
• problem
• question
• riddle
• secrecy
• subtlety
• thriller

---