Definition of war:
the waging of armed conflict against an enemy; "thousands of people were killed in the 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"
an active struggle between competing entities; "a price war"; "a war of wits"; "diplomatic warfare"
a concerted campaign to end something that is injurious; "the war on poverty"; "the war against crime"
make or wage war