belligerency

belligerency noun affray, aggression, aggressiveness, altercation, animosity, antagonism, assault, attack, battling, bellicosity, belligerance, clashing, combat, combativeness, conflict, contentiousness, contestation, controversy, discord, disputation, dissension, disturbance, encounter, enmity, feud, fighting, fracas, hostility, impugnment, inimicality, malevolence, martiality, melee, militancy, opposition, oppugnancy, oppugnation, pugnacity, resort to arms, revengefulness, riot, rivalry, scuffle, siege, sparring, state of siege, state of war, strife, time of war, tumult, tussle, unpeacefulness, violence, warfare, warlikeness, wartime, wrangle
Associated concepts: adverse possession, belligerency de facto, international law, national defense

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See also: argument, conflict, contention, strife