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A sequence of characters serving as identification when accessing a computer, other digital device, or application and often associated with a privately held password. Also called user ID.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Computer Science) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014