cer·tain·ty/`sɜtṇtɪ; ˈsɜːtnti/ n 1 [U] when you are completely sure about something 确定，无疑: with certainty It is difficult to say with absolute certainty what time the crime took place. 很难十分确定地说罪案是何时发生的。 2 [C] something that is definitely true or will definitely happen 确定［实］的事; 必然发生的事: It's a certainty that prices will continue to rise. 价格必然会继续上涨。