1. An occurrence or incident that happens by accident or fortune rather than by design or planning
Winning the lottery was a mere chance event.
Ganhar na loteria foi um mero evento aleatório.
2. In probability and statistics, an outcome that occurs with some probability in an uncertain situation
The chance event of rolling a six on a die is one in six.
O evento aleatório de sair um seis no dado é uma em seis possibilidades.