[uncountable, countable] an official way of showing who you are, for example a document with your name, date of birth and often a photograph on it身份；身份证◆You must carry ID at all times.你必须随身携带身份证。◆an ID card/badge/number身份证；身份标牌；身份证号码ⓘ ID is a short form of ‘identity’ or ‘identification’.ID 是 identity 或 identification 的缩写。