(The name of) the god of war of the ancient Romans, ranking in importance next to Jupiter, and identified from an early period with the Greek god…

Hostile contention by means of armed forces, carried on between nations, states, or rulers, or between parties in the same nation or state; the…

The plural (esp. with definite article) was formerly often used in the same sense as the singular.

In specific uses. Iron weaponry, as swords, spears, etc. Chiefly in various allusive expressions referring to warfare or slaughter, as iron and fire…

War.

Also as mart. War, battle. Frequently in in equal mart: in a fair contest, on equal terms.

A kind of action; one of the operations practised in any art or profession; also, in more comprehensive sense, a department of action, a pursuit…

Military service; warfare. Obsolete.

(with the) (a) hunting; (b) warfare; (c) horse racing (now the usual sense); (d) surfing.

concrete. spec., as a political term, to describe a condition approximating to that of war; occasionally as a synonym or euphemism for war; also sta…