Usually means: Unique ID distinguishing individual users.
Definitions Related words Mentions
We found 6 dictionaries that define the word user identifier:

General (2 matching dictionaries)
  1. user identifier: Dictionary.com
  2. User identifier (Unix), User identifier: Wikipedia, the Free Encyclopedia

Computing (3 matching dictionaries)
  1. user identifier: Free On-line Dictionary of Computing
  2. User identifier (Unix), user identifier, User identifier: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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Definitions from Wikipedia (User identifier)

▸ noun:  Unix-like operating systems identify a user by a value called a user identifier, often abbreviated to user ID or UID.


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