Mystery is defined as something that is a secret, something where there is no clear explanation, something difficult to understand or explain or something unexplainable or unsolvable.
(noun)See mystery in Webster's New World College Dictionary
noun pl. mysteries
Origin: ? infl. by mystery
mystery playOrigin: ME mysterye < L mysterium (in N.T., supernatural thing) < Gr mystērion, a secret rite (in N.T., divine secret) < mystēs, one initiated into the mysteries < myein, to initiate into the mysteries, orig., to close: see myope
noun pl. mysteries
Origin: altered < ME misterie, a trade, craft < ML misterium, altered < L ministerium, office, occupation (see minister), by confusion with mysterium (see mystery)
See mystery in American Heritage Dictionary 4
noun pl. mys·ter·ies
Origin:
Origin: Middle English misterie
Origin: , from Latin mystērium
Origin: , from Greek mustērion, secret rite
Origin: , from mustēs, an initiate
Origin: , from mūein, to close the eyes, initiate
.noun pl. mys·ter·ies
Origin:
Origin: Middle English misterie, service, craft
Origin: , from Medieval Latin misterium, craft-guild
Origin: , from Late Latin
Origin: , alteration of Latin ministerium, occupation
Origin: , from minister, assistant, servant; see mei-2 in Indo-European roots
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