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Definition of alias noun from the Oxford Advanced Learner's Dictionary

alias

noun
 
/ˈeɪliəs/
 
/ˈeɪliəs/
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  1. a false or different name, especially one that is used by a criminal
    • He checked into the hotel under an alias.
    Extra Examples
    • After her escape from prison, Claire Potter adopted the alias Margaret Smith.
    • One of his known aliases is Ed Neil.
    • A conman used an alias to infiltrate the organization.
    • It soon emerged that all three names were aliases for the same person.
    Oxford Collocations Dictionaryadjective
    • known
    • email
    • online
    verb + alias
    • adopt
    • assume
    • go by
    preposition
    • under an/​the alias
    See full entry
  2. (computing) a name that can be used instead of the actual name for a file, internet address, etc.
    • You can also use our easy-to-remember forwarding alias.
    • On his website he uses the online alias ‘Maddox’.
  3. Word Originlate Middle English: from Latin, ‘at another time, otherwise’.
See alias in the Oxford Advanced American Dictionary

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