\Ag*no"men\ ([a^]g*n[=o]"m[e^]n), n. [L.; ad + nomen
name.]
1. An additional or fourth name given by the Romans, on
   account of some remarkable exploit or event; as, Publius
   Caius Scipio Africanus.
2. An additional name, or an epithet appended to a name; as,
   Aristides the Just.