1911 Encyclopædia Britannica/Alias

ALIAS (Lat. for “at another time”), a term used to connect the different names of a person who has passed under more than one, in order to conceal his identity, or for other reasons; or, compendiously, to describe the adopted name. The expression alias dictus was formerly used in legal indictments, and pleadings where absolute precision was necessary in identifying the person to be charged, as “John Jones, alias dictus James Smith.” The adoption of a name other than a man’s baptismal or surname need not necessarily be for the purpose of deception or fraud; pseudonyms or nicknames fall thus under the description of an alias. Where a person is married under an alias, the marriage is void when both parties have knowingly and wilfully connived at the adoption of the alias, with a fraudulent intention. But if one of the parties to a marriage has acquired a new name by use and reputation, or if the true name of any one of the parties is not known to the other, the use of an alias in these cases will not affect the validity of the marriage.