mystery (countable and uncountable, plural mysteries) The truth behind the events remains a mystery. The case was that of a murder. It had an element of mystery about it, however, which was puzzling the authorities. A turban and loincloth soaked in blood had been found; also a staff.
MYSTERY definition: anything that is kept secret or remains unexplained or unknown. See examples of mystery used in a sentence.
mystery - Traces back to Greek mustikos, "secret," and musterion, "secret rites"; the lesser-known meaning of mystery as "handicraft; art" is part of the phrase "mystery play."