alias
n. countable B2 Upper Intermediate US //ˈeɪɫiəs// UK //ˈeɪliəs// alias
n. a different name that a person uses instead of their real one.
n. an assumed or alternative name used by a person, often to conceal identity or for convenience.
He uses an alias when he writes online.
The detective tracked the suspect under an alias to avoid detection.
In literature, the use of an alias often signals a character's desire to reinvent themselves or escape a burdensome past.
From Latin alias (“at another time; at another place, elsewhere, under other circumstances, otherwise”). See else and alien.