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user ID

 - 3 dictionary results
us·er·name   (yōō'zər-nām')   
n.  A sequence of characters, different from a password, that is used as identification and is required when logging on to a multiuser computer system, LAN, bulletin board system, or online service. Also called user ID.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Main Entry:  user ID
Part of Speech:  n
Definition:  See username
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Computing Dictionary

user id
user identifier

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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