alias

An alias is another name that a person uses.

Example: The actor used the alias "Amanda Xi" when she checked into the hotel.

An alias is a false name used to hide who someone really is.

Example: The suspect was travelling under the alias "Michael Stone".

In computing, an alias is a different name used for a file, command, or email address.

Example: I made an alias for the long command so I could type it more quickly.