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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 name

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 name
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 name

username

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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user name in Technology
operating system, security
(Or "logon") A unique name for each user of computer services which can be accessed by several persons.
Users need to identify themselves for accounting, security, logging, and resource management. Usually a person must also enter a password in order to access a service. Once the user has logged on the operating system will often use a (short) user identifier, e.g. an integer, to refer to them rather than their user name.
User names can usually be any short string of alphanumeric characters. Common choices are first name, initials, or some combination of first name, last name, initials and an arbitrary number. User names are often assigned by system administrators according to some local policy, or they may be chosen by the users themselves.
User names are often also used as mailbox names in electronic mail addresses.
(1997-03-16)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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