Alias Wiki is a database about the ABC TV series Alias starring Jennifer Gardner as Sydney Bristow that anyone can edit. The entire world of 'ALIAS' is turned upside down. Sloane disappears mysteriously and Anthony Geiger becomes the new head of SD-6. As the Bristows struggle to keep their secrets safe and stay one step ahead of Geiger, Will and Francie make a startling discovery of their own while Francie prepares to open her new restaurant. Learn the meaning and usage of the word alias, a false name or another name that someone is known by. Find synonyms, related words, and examples of alias in sentences and different languages. The meaning of ALIAS is an assumed or additional name that a person sometimes uses; sometimes, specifically : a pseudonym (such as a pen name or stage name) that is associated with a person's professional identity.