Definition of ID noun from the Oxford Advanced American Dictionary

     

    ID

     noun
    noun
    NAmE//ˌaɪ ˈdi//
     
     
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  1. 1 [uncountable, countable] the abbreviation foridentificationoridentity(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
  2. 2[countable]identificationThe police need a witness to make a positive ID. see also caller ID
See the Oxford Advanced Learner's Dictionary entry: ID