A chance event is an unpredictable occurrence that is not planned or expected. The term can be defined by three words: FORTUITY (8 letters), LOTTERY (7 letters), and ACCIDENT (8 letters). FORTUITY is a synonym for chance, and it refers to something that happens by luck or randomness. A LOTTERY is a game of chance in which players purchase tickets with the hope of winning a prize. An ACCIDENT is an unexpected and unintentional event that often has negative consequences.