Etymology
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alias (adv.)

mid-15c., "otherwise called," from Latin alias (adv.) "at another time," in Late Latin also "in another way, under other circumstances," from alius "another, other, different," from PIE root *al- (1) "beyond," which is the source also of English else.

alias (n.)

"assumed name," c. 1600, from alias (adv.).

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Definitions of alias
1
alias (n.)
a name that has been assumed temporarily;
Synonyms: assumed name / false name
2
alias (adv.)
as known or named at another time or place;
Mr. Smith, alias Mr. Lafayette
Synonyms: a.k.a. / also known as
From wordnet.princeton.edu