Definitions:

1. a name that has been assumed temporarily noun
   • An alias is an assumed name taken by someone.
2. a name that has been assumed temporarily noun
   • Another word for a nickname is an alias.
3. a name that has been assumed temporarily noun
   • Her real name was Mary, but she went by the alias of 'Jane' when she was on the run from the law.
4. as known or named at another time or place adverb
   • An alias is an assumed name taken by someone.

Synonyms:

• a.k.a.
• assumed name
• false name