I.brotherhood, fraternity (post-Aug. and very rare): “fraternitatis vinculum,” Lact. 5, 6, 12: “Aedui soli Gallorum fraternitatis nomen cum populo Romano usurpant,” Tac. A. 11, 25; Vulg. Rom. 12, 10; Quint. Decl. 16, 2 (cf. frater, Il. A. fin., and fraternus, Il.).
frāternĭtas , ātis, f. fraternus,