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username - 2 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:  username
Part of Speech:  n
Definition:  the unique set of characters identifying a user of a shared computer program, system, or network, which allows access when coupled with a password; also written user name, also called user ID
Etymology:  1971-76
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