Definition 2024





identifier (plural identifiers)

  1. Someone who identifies; a person who establishes the identity of.
    • 2001, Theodore A. Landers, The Career Guide to the Horse Industry:
      The Identifier personally inspects each horse in each race by verifying the lip tattoo, body color, head and leg markings, scars, and chestnut (night eyes).
    • 2004, John McEvoy, Great Horse Racing Mysteries: True Tales from the Track:
      The foal papers are documents recording the horse's registration; no horse can start in any race unless his papers are in the hands of the track's identifier.
  2. Something that identifies or uniquely points to something or someone else.
    • 2008, Ted Dunstone, Neil Yager, Biometric System and Data Analysis:
      Prehistoric artists used hand-prints in cave paintings, perhaps as as 'signature'. They might be considered the earliest example of a biometric identifier.
  3. A guidebook that helps determine the specific class of an object (such as a mushroom, herb, fish, bird, drug, or mineral), or its individual identity (such as that of a star).
  4. (programming, operating systems) A formal name used in source code to refer to a variable, function, procedure, package, etc. or in an operating system to refer to a process, user, group, etc.
  5. (databases) A primary key.

See also


See also



From Vulgar Latin *identificare.




  1. to identify
  2. to log in