an additional, fourth name given to a person by the ancient Romans in allusion to some achievement or other circumstance, as “Africanus” in “Publius Cornelius Scipio Africanus.” Compare cognomen(def. 3).
2.
a nickname.
Origin: 1745–55; < LL, equiv. to ad-ad-+ nōmen name, with alter. to ag- through influence of agnōscere;see agnize