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mys·ter·y 1 (mĭstə-rē)
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n. pl. mys·ter·ies
1. One that is not fully understood or that baffles or eludes the understanding; an enigma: How he got in is a mystery.
2. One whose identity is unknown and who arouses curiosity: The woman in the photograph is a mystery.
3. A mysterious character or quality: a landscape with mystery and charm.
4. Something that is a secret: “From the first, some private trouble weighed on his mind, and since he chose to make a mystery of its cause, a biographer is bound to respect his wish” (Henry Adams).
5.
a. A work of fiction, such as a novel or a movie, that has a story centered around solving a puzzling crime or mysterious event.
b. A nonfictional account of a puzzling crime or mysterious event presented in the manner of a mystery.
6.
a. A religious cult practicing secret rites to which only initiates are admitted.
b. A secret rite of such a cult.
7. A religious truth that is incomprehensible to reason and knowable only through divine revelation.
8. Christianity
a. An incident from the life of Jesus, especially the Incarnation, Passion, Crucifixion, or Resurrection, of particular importance for redemption.
b. One of the 15 incidents from the lives of Jesus or the Blessed Virgin Mary, such as the Annunciation or the Ascension, serving in Roman Catholicism as the subject of meditation during recitation of the rosary.
9.
a. also Mystery One of the sacraments, especially the Eucharist.
b. mysteries The consecrated elements of the Eucharist.
10. often mysteries The skills, lore, or practices that are peculiar to a particular activity or group and are regarded as the special province of initiates: the mysteries of Freemasonry; the mysteries of cooking game.
11. A mystery play.

[Middle English misterie, from Latin mystērium, from Greek mustērion, secret rite, from mustēs, an initiate, from mūein, to close the eyes, initiate. Senses 9, 10, and perhaps 11, partly from Middle English misterie, occupation, craft-guild; see MYSTERY2.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 
mys·ter·y 2 (mĭstə-rē)
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n. pl. mys·ter·ies
Archaic
1. A trade or occupation.
2. A guild, as of merchants or artisans.

[Middle English misterie, from Medieval Latin misterium, alteration (influenced by Latin mystērium, secret rite) of Latin ministerium, from minister, assistant, servant; see mei-2 in the Appendix of Indo-European roots.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.