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Jus ad bellum (/juːs/ YOOS or /dʒʌs/ in the traditional English pronunciation of Latin; Latin for "right to war") is a set of criteria that are to be consulted before engaging in war in order to determine whether entering into war is permissible, that is, whether it will be a just war. This is distinct from the set of rules that ought to be followed during a war, known as jus in bello.