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username

[yoo-zer-neym] /ˈyu zərˌneɪm/
noun, Computers.
1.
Also called login name, logon name, sign-in name, sign-on name. a unique sequence of characters used to identify a user and allow access to a computer system, computer network, or online account.
2.
the part of an e-mail address before the @ sign.
Also called user ID.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for user id

username

/ˈjuːzəˌneɪm/
noun
1.
(computing) a name that someone uses for identification purposes when logging onto a computer, using chatrooms, or as part of his or her e-mail address
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for user id
noun

See username

Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, LLC
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Word Origin and History for user id

username

n.

by 1982, from user + name (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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user id in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Nearby words for user id
http://dictionary.reference.com/browse/user+id
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