Definition of ID noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˌaɪ ˈdiː//
    ; NAmE NAmE//ˌaɪ ˈdiː//
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  1. 1[uncountable, countable] the abbreviation for identity or identification (an official way of showing who you are, for example a document with your name, date of birth and often a photograph on it) You must carry ID at all times. The police checked IDs at the gate. an ID card The government is trying to introduce compulsory ID cards. You will need some form of photo ID.
  2. 2[countable]identificationThe police need a witness to make a positive ID. see also caller ID
See the Oxford Advanced American Dictionary entry: ID