Black's Law Dictionary (2nd edition)dictionaries

Agnomen

Lat. An additional name or title; a nickname. A name or title which a man gets by some action or peculiarity; the last of tlie four names sometimes given a Roman. Thus, Scipio Africanus, (the Afri-can,) from his African victories. Ainsworth; Calvin

Source: Black's Law Dictionary 2nd Ed (1910)