Definition of identifier in US English:



  • 1A person or thing that identifies something.

    ‘the new number is to be known as the “unique patient identifier.”’
    • ‘In that sense we use the metaphor of the bar code, it's a unique identifier for each species.’
    • ‘These data were then used to create unique identifiers for unduplicating and matching case records according to a predetermined process.’
    • ‘By necessity, this survey is anonymous, with no unique identifiers at all.’
    • ‘The system gives patients a unique identifier and records details of sex, age, and each outpatient referral (including the specialty and dates of subsequent appointments).’
    • ‘A verification process for release of autografts should use two unique patient identifiers to ensure that the correct procedure, site, position, and implants are used for the correct patient.’
    • ‘The Driver and Vehicle Licensing Agency introduced new plates on Saturday, with location and age identifiers within the registration numbers.’
    • ‘The introduction and use of biometric identifiers will be pursued so as to guarantee more effective identification of holders of travel and residence documents and to improve the securitisation of certain types of documents.’
    • ‘The accession numbers/gene identifiers of the sequences are shown.’
    • ‘Those variables and other geographic identifiers were useful when predicting the price of child care facing mothers across different regions of the country.’
    • ‘Optical and photonic technology can address this area by providing unique biometric identifiers.’
    • ‘Think about it - the signs will probably have a unique identifier anyway, given by the roads crew to facilitate their placement.’
    • ‘We can provide rough sketches of how he looks, and probe for unique identifiers.’
    • ‘Sequence identifiers are shown inside the nodes.’
    • ‘Used in combination with other identifiers such as passwords and user names, hardware features such as processor serial number can provide added confidence.’
    • ‘On the face of it, the National Student Number system is used for fairly benign purposes, but the Greens have always been concerned that these unique personal identifiers could be readily misused.’
    • ‘Because member numbers can change, the date of birth is a unique identifier used to confirm that we are accessing the correct account and to eliminate duplicate subscriptions.’
    • ‘The interview tapes were transcribed verbatim and assigned a unique identifier for each participant.’
    • ‘To radio listeners, it sounds vaguely like the quacking of a duck, but encoded within it is a timestamp, a station identifier, a region code, an expiration time, and a three-letter event code identifying the type of alert.’
    • ‘This is of very little use unless combined with other - more unique - personal identifiers.’
    • ‘All responses were anonymous and linked to individual respondents through a unique identifier, where only independent research assistants were able to match identifiers to students.’
    1. 1.1Computing A sequence of characters used to identify or refer to a program or an element, such as a variable or a set of data, within it.
      • ‘You may need to query the/proc/bus/usb filesystem for your available USB identifiers, and you may need to try each identifier to find which one applies to your hardware.’
      • ‘Next, the host performs a series of numerical operations on stored keys and identifiers to assemble a Content Key.’
      • ‘Also, some dependencies might not have filenames but are abstract identifiers that might be provided by any number of alternative packages.’
      • ‘Rather, the filename's location will be resolvable with reference to its identifier.’
      • ‘Similarly, an identifier used in program source text, such as is meant to stand for a global procedure or data type, could be made to refer to the source text defining the value to be bound to that global at runtime.’