aliaspreposition
uk/ˈeɪ.li.əs/us/ˈeɪ.li.əs/used when giving the name that a person is generally known by, after giving their real name:
Malcolm Little, alias Malcolm X
aliasnoun [ C ]
uk/ˈeɪ.li.əs/us/ˈeɪ.li.əs/a false name, especially one used by a criminal:
He travels under (= using) an alias.