nomen (?n??m?n) n, pl nomina (?n?m?n?) (Historical Terms) an ancient Roman’s second name, designating the person’s gens or clan. See also agnomen, cognomen, praenomen[Latin: a name]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014no?men (?no? m?n) n., pl. nom?i?na (?n?m ? n?, ?no? m?-) (in ancient Rome) the second name of a citizen, indicating the person’s gens, as ?Gaius Julius Caesar.? [1885?90;