a fictitious name used by an author to conceal his or her identity; pen name. Compare allonym ( def 1 ).

1840–50; < Greek pseudṓnymon false name; see pseud-, -onym

alias, nom de plume. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pseudonym (ˈsjuːdəˌnɪm)
a fictitious name adopted, esp by an author
[C19: via French from Greek pseudōnumon]

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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Word Origin & History

1706 (in pseudonymous), from Fr. pseudonyme (adj.), from Gk. pseudonymos "having a false name," from pseudes "false" + onyma dial. form of "name." Properly of made-up names; the name of an actual author or person of reputation, affixed to a work he or she did not write, is an allonym. An author's actual
name affixed to his or her work is an autonym (1867). Pseudonymous first recorded 1706.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As with some group blogs today, contributors could be required to log in, either under their real name or a pseudonym.
The present is the past traveling under a pseudonym.
Although it is not necessary, you may provide your name and address or pseudonym if you wish.
Cross references are made to authors using more than one pseudonym.
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