Noun:
1: war, warfare the waging of armed conflict against an enemy; "thousands of people were killed in the war"
2: state of war, war a legal state created by a declaration of war and ended by official declaration during which the international rules of war apply; "war was declared in November but actual fighting did not begin until the following spring"
3: warfare, war an active struggle between competing entities; "a price war"; "a war of wits"; "diplomatic warfare"
4: war a concerted campaign to end something that is injurious; "the war on poverty"; "the war against crime"
Verb:
1: war make or wage war