What does alias mean?
The definition of alias
A”li*as, adv.
Etym: [L., fr. alius. See Else.] (Law)
(a) Otherwise; otherwise called; — a term used in legal proceedings to connect the different names of any one who has gone by two or more, and whose true name is for any cause doubtful; as, Smith, alias Simpson.
(b) At another time.

A”li*as, n.; pl. Aliases.
Etym: [L., otherwise, at anothertime.]
Etym: (Law)
(a) A second or further writ which is issued after a first writ has expired without effect.
(b) Another name; an assumed name.