/ ˈeɪliəs; NAmE / adverb , noun
■ adverb
used when a person, especially a criminal or an actor, is known by two names :
Mick Clark, alias Sid Brown
Inspector Morse, alias John Thaw (= John Thaw plays the part of Inspector Morse)
John Thaw, alias Inspector Morse of the famous TV series
■ noun
1.
a false or different name, especially one that is used by a criminal :
He checked into the hotel under an alias.
2.
( computing ) a name that can be used instead of the usual name for a file, Internet address, etc.
••
WORD ORIGIN
late Middle English : from Latin , at another time, otherwise .