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Something strange or not known that has not yet been explained or understood: See examples of mystery used in a sentence. The lesser-known meaning of mystery as handicraft; Mystery applies to what cannot be fully understood by reason or less strictly to whatever resists or defies explanation. Mystery - traces back to greek mustikos, secret, and musterion, secret rites; Art is part of the phrase mystery play. Anything that is kept secret or remains unexplained or unknown. Mystery, problem, enigma, riddle, puzzle mean something which baffles or perplexes.