noun, plural aliases.
a false name used to conceal one's identity; an assumed name: The police files indicate that “Smith” is an alias for Simpson.
at another time; in another place; in other circumstances; otherwise. “Simpson alias Smith” means that Simpson in other circumstances has called himself Smith.

1525–35; < Latin aliās (adv.): at another time, otherwise; cf. else

1. nom de guerre; nom de plume, pseudonym. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alias (ˈeɪlɪəs)
1.  at another time or place known as or named: Dylan, alias Zimmerman
n , -ases
2.  an assumed name
[C16: from Latin aliās (adv) otherwise, at another time, from alius other]

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

mid-15c., lit. "otherwise called," from L. alias "at another time, in another way," from alius "(an)other," from PIE *al- "beyond" (cf. Skt. anya "other, different," Avestan anya-, Armenian ail, Gk. allos "another," Goth. aljis "other," O.E. elles "otherwise, else," Mod.Eng.
else). The noun meaning "assumed name" is first recorded c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They can change their aliases as many times as they want, no limit.
It is not unusual for immigrants to have several aliases.
It does not give the addresses of the non-predators, but it does give their zip
  codes and aliases.
Phase is unknown of course, as it's undetectable in the data outside its
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