mor·tal·i·ty/mɔr`tælətɪ; mɔːˈtælɪti/ n [U] 1 also 又作 mortality rate the number of deaths during a particular period of time or from a particular cause 死亡率: infant mortality (=the rate at which babies die) 婴儿死亡率 2 the condition of being human and having to die 〔人的〕必死性: After the heart attack, I became more aware of my own mortality. 那次心脏病发后，我更加意识到自己终有一死。