• 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).
  • Something that identifies or uniquely points to something or someone else.
  • (databases) A primary key.
  • Someone who identifies; a person who establishes the identity of.
  • (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.

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