bellum, -i, n. war, warfare

Aeneid 1.21, 'hinc populum late regem belloque superbum/venturum excidio Libyae' (from this place there would come a people widely ruling and arrogant in war for the destruction of Libya).
cf. bellicosus, -a, -um, adj., warlike. Eng., bellicose, warlike in manner or temperament. The Encyclopedia of World History, 91: The tribune M. Livius Drusus proposed a comprehensive program that included a grain bill, a colony bill, mixed senatorial-equestrian juries, and, most important, Roman citizenship for the now desperate and bellicose Italian allies. United opposition voided Livius's laws, Livius himself was assassinated, and the Italians prepared for a war of secession against Rome.