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.

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mystery ² American  

[mis-tuh-ree] / ˈmɪs tə ri /

noun

Archaic.

• mysteries
  plural

1. a craft or trade.

2. a guild, as of merchants.

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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

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mystery ² British  

/ ˈmɪstərɪ /

noun

1. a trade, occupation, or craft

2. a guild of craftsmen

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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

Weightier than any of that is the ever-more involuted mystery enveloping the real Elizabeth Short, whose murder has inspired fictionalized homages before De Palma’s movie and since, but has yet to be satisfactorily rendered onscreen.

From Salon ● Sep. 18, 2026

It’s the mystery of the self—how much of our personality is ephemeral, and what, if anything, is immutable.

From The Wall Street Journal ● Sep. 18, 2026

Yet exactly how cells manage to trigger such dramatic regrowth has remained a mystery.

From Science Daily ● Sep. 18, 2026

This week sees two new mystery series with literary roots, which is not necessarily to say in literature.

From Los Angeles Times ● Sep. 16, 2026

The exact date of when Boo came into the Very, Very Far North remains a mystery.

From "The Very, Very Far North" by Dan Bar-el

Decoder Ring, Slate’s podcast about cracking cultural mysteries, turns its investigatory powers inward to explore what exactly a “podcast” is these days, as more and more shows pivot from audio to video.

From Slate ● Sep. 9, 2026

Dark matter is one of the biggest unsolved mysteries in modern physics.

From Science Daily ● Sep. 6, 2026

For the researchers on the ship, seeing the creature was a reminder, if they needed one, of how many mysteries the deep still holds.

From Los Angeles Times ● Sep. 5, 2026

Per Mr. Horowitz’s practice, and his “Marble Hall” script, the parallel mysteries are cast with the same actors, playing similar roles in each.

From The Wall Street Journal ● Sep. 3, 2026

Something to give more clues about the mysteries inside.

From "A Bird Will Soar" by Alison Green Myers

Related Words

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