(Law)an act or thing that is legally void (律)法律上无效的行为;法律上无效的东西 ■[mass noun]the state of being legally void; invalidity, especially of a marriage 法律上的无效;无法律效力(尤指婚姻)
a thing of no importance or worth 不重要的东西,无价值的东西 ■[mass noun]nothingness 无,不存在
语源
mid 16th cent.: from French nullité, from medieval Latin nullitas, from Latin nullus 'none'