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Definition of war : 1. A condition of belligerency to be maintained by physical force. In this sense, levying war against the sovereign authority is treason.
2. A contest between nations or states, carried on by force, whether for defence, for revenging insults and redressing wrongs, for the extension of commerce, for the acquisition of territory, for obtaining and establishing the superiority and dominion of one over the other, or for any other purpose; armed conflict of sovereign powers; declared and open hostilities.
3. a state of opposition or contest; an act of opposition; an inimical contest, act, or action; enmity; hostility.
4. Forces; army.
5. Instruments of war.
6. The profession of arms; the art of war.
7. To carry on, as a contest; to wage.
8. To contend; to strive violently; to fight.
9. To make war upon; to fight.
10. To make war; to invade or attack a state or nation with force of arms; to carry on hostilities; to be in a state by violence.
11. Ware; aware.

Synonyms:

quarrel, heavy lifting, disunion, disaccord, sweepstakes, the Battle of Britain, division, race, rivalry, belligerency, dissentience, work, challenge, controversy, dissidence, disagreement, argument, discord, faction, difficulty, confrontation, incursion, care, competition, a war of words, contend, Auschwitz, pursuit, Allied, corrivalry, conflagration, effort, mission, strain, schism, disharmony, Benedict Arnold, face-off, strife, hot war, antebellum, duel, dissension, discordance, grapple, contention, dispute, skirmish, Armistice Day, dissonance, dogfight, state of war, match, infighting, misunderstanding, the Allies, ball game, the Axis, clash, the Berlin Wall, friction, disunity, free-for-all, tug of war, discordancy, the Bay of Pigs, exertion, dissent, wrestle, inharmony, pitched battle, tilt, difference, undertaking, variance, striving, dedication

attack (part of speech: noun)

battle, fury, furor, offense, foray, spasm, combat, onslaught, invasion, riot, strike, charge, violence, sortie, aggression, raid, bloodshed, warfare, siege, bombardment, barrage, assault, storm, thrust, outbreak, tirade, fight, attack, frenzy

warfare (part of speech: noun)

crusade, conflict, hostility, engagement, offensive, jihad, tussle, scramble, contest, drive, scuffle, warpath, campaign, guerre, struggle

conflict (part of speech: verb)

fighting, chemical-bacteriological-radiological war of attrition, biological, revolutionary, chemical, holy war, atomic-bacteriological-chemical, guerrilla, nuclear, preventive, naval, sea, germ, war to end all wars, ground, hostilities, atomic, Armageddon, civil, push-button, religious, cold, political, war of nerves, hot, world, shooting, three-dimensional, total, blitzkrieg, land, trench, psychological, limited, amphibious, bacteriological, defensive, aerial

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