Identifier meaning

Frequency:
Any label, symbol or token that names or identifies an entity or a collection of data. See identification.
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Someone who identifies; a person who establishes the identity of.
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Something that identifies or uniquely points to something or someone else.
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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).
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(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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(databases) A primary key.
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Origin of identifier