us·er·name

[yoo-zer-neym]
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. 2013.
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World English Dictionary
username (ˈjuːzəˌneɪm) [Click for IPA pronunciation guide]
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Username is always a great word to know.
So is doohickey. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
Dictionary.com's 21st Century Lexicon
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
Dictionary.com's 21st Century Lexicon
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Example sentences
Your username and general profile confirm your story.
To receive your username please enter your email address below.
Visit my blog at the website of my username for more information.
The username is randomly generated by the site, haven't got round to changing it.
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