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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.
Contemporary Examples

Hubbard, who went under the aliases Larry David Barnes and Larry Lamar Ratcliff, moved to Florida in the early 1970s.
Los Angeles Police Pin Old Murders of Three Women on Dead Serial Killer Christine Pelisek August 2, 2012

Historical Examples

Most of the mimicries in nature gradually became as suspicious to the primitive observer as aliases to a magistrate.
Demonology and Devil-lore Moncure Daniel Conway

Which will you have, caballero—my nom de guerre, or any other of my aliases?
The Tiger-Slayer Gustave Aimard

He still was an enigma whose veil was not entirely stripped away because one of his aliases was known.
The Red River Half-Breed Gustave Aimard

All manner of rogues and roguery has immemorially delighted in aliases.
Dealings With The Dead A Sexton of the Old School

“With half a dozen aliases at your back, I dare say,” cried Coates.
Rookwood William Harrison Ainsworth

It will all be sponged up in Threadneedle Street by the poetic swindlers whose names, or aliases, you hold in your hand.
Love Me Little, Love Me Long Charles Reade

From under a succession of aliases he uncovered Gorman’s real name.
From Place to Place Irvin S. Cobb

Yes; I have observed a number of aliases where there is no particular effort to disguise.
Warren Commission (4 of 26): Hearings Vol. IV (of 15) The President’s Commission on the Assassination of President Kennedy

The patient landlord began to lose that virtue, and denounced these aliases as swindlers.
Cornelius O’Dowd Upon Men And Women And Other Things In General Charles Lever

adverb
at another time or place known as or named: Dylan, alias Zimmerman
noun (pl) -ases
an assumed name
adv.

mid-15c., “otherwise called,” from Latin alias “at another time, in another way,” from alius “(an)other,” from PIE *al- “beyond” (cf. Sanskrit anya “other, different,” Avestan anya-, Armenian ail, Greek allos “another,” Gothic aljis “other,” Old English elles “otherwise, else,” Modern English else).
n.

“assumed name,” c.1600, from alias (adv.).