1 [U,C] an official way of showing who you are, for example a document with your name, date of birth and often a photograph on it (abbreviation for 'identity' or 'identification'):
You must carry ID at all times. * The police checked IDs at the gate. * an ID card
2 [C] IDENTIFICATION:
The police need a witness to make a positive ID.
verb (ID's, ID'ing, ID'd, ID'd) [VN] (informal) = IDENTIFY
