prep. short for "also known as". Used while addressing someone with a name other than legal name like nickname, middle name.
A.K.A. (also known as) is slang for alias.
a.k.a.; aka; AKA An American English acronym for also known as. An alias is a term used to indicate another name by which a person is known. It is short for alias dictus; otherwise known as a.k.a. When used in connection with a description of a person, it indicates that he/she has used or been known by another name. A fictitious name assumed by a...
also known as: According to police records he is Joe Smith a.k.a. “Baby Face Smith” and Joseph Smathers.