a·li·as

[ey-lee-uhs] noun, plural a·li·as·es, adverb
noun
1.
a false name used to conceal one's identity; an assumed name: The police files indicate that “Smith” is an alias for Simpson.
adverb
2.
at another time; in another place; in other circumstances; otherwise. “Simpson alias Smith” means that Simpson in other circumstances has called himself Smith.

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


1. nom de guerre; nom de plume, pseudonym.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
alias (ˈeɪlɪəs) [Click for IPA pronunciation guide]
 
adv
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
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00:10
Aliases is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Etymonline
Word Origin & History

alias
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
Online poker allows the pros to choose to compete as themselves and as aliases,
  sitting in on tables of other pros and novices.
It is not unusual for immigrants to have several aliases.
Casting directors have called actors at home and urged them to cross the line
  under aliases.
Soon they knew the agents' aliases, where they had stayed, and who else they
  had called.
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