fraternal /fɹəˈtɝnəl/adjective 4noun 2forms 3 adjective4 •Of or pertaining to a brother or brothers.By Cognate or Domestic duties, we mean those which grow out of the different family relations; and which may be classed as conjugal, parental, filial, and fraternal. — 1844 •Of twins or embryos, produced from two different eggs and sperm, and genetically distinct.Seventy percent of twins are fraternal and result from fertilization of two separate ova by two different sperm. — 2012 •Of or pertaining to a fraternity.The changing Afro-American class structure shaped the war and postwar growth of black religious and fraternal organizations in southern West Virginia. — 1990 •Platonic or friendly.He took advantage of this opportunity to consider Christian liberty in its relation to the demands of fraternal charity. — 1986 noun2 •A fraternal twin.Her twins were adorable boy-girl fraternals who wore boy-girl clothes in the same fabric. — 2001 •A society formed to provide mutual aid, such as insurance.Here comes in the importance of the proposed bill for the uniform regulation of fraternals. — 1902 formsfraternals · more fraternal · most fraternal