Mystery is a fiction genre where the nature of an event, often a murder or other crime, remains mysterious until the end of the story. Often within a closed circle of suspects, each suspect is usually … 3 days ago · mystery, problem, enigma, riddle, puzzle mean something which baffles or perplexes. mystery applies to what cannot be fully understood by reason or less strictly to whatever resists or … MYSTERY definition: 1. something strange or not known that has not yet been explained or understood: 2. Definition of mystery noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Apr 26, 2026 · Noun mystery (countable and uncountable, plural mysteries) Something secret or unexplainable; an unknown. MYSTERY definition: anything that is kept secret or remains unexplained or unknown. See examples of mystery used in a sentence.