(intransitive) To enter into an armed conflict. / (intransitive) (of a person) To depart, typically from one's home, to join an army at war.

(historical) The period of hostility short of open war between the Soviet Bloc and the Western powers, especially the United States, between 1945 and 1991.

(Internet) A dispute on a wiki or in a git repository where two users repeatedly revert one another's changes to an article.

A woman who marries a man who is on active military duty in wartime; especially, a woman who marries a foreign soldier serving in her country and then emigrates to his.

A war involving the major nations of the world.

Before the most recent or significant war in a culture's history. / Before the outbreak of World War I in 1914. / Before the outbreak of World War II in 1939.

After the most recent or significant war in a culture's history. / After the end of World War II in 1945.

A game or competition in which two teams pull or tug on opposite ends of a rope trying to force the other team over the line which initially marked the middle between the two teams.

Alternative spelling of interwar

(law) A punishable offense, under international law, for violations of the law of war by any person or persons, military or civilian.