Pronunciation: (ag-nō'mun), [key]
—pl. -nom•i•naPronunciation: (-nom'u-nu). [key]
1. 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.” Cf. cognomen (def. 3).
2. a nickname.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.