Jus Belli
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
The law of war. The law of nations as applied to a state of war, defining in particular the rights and duties of the belligerent powers themselves, and of neutral nations. The right of war; that which may be done without injustice with regard to an enemy. Gro. de Jure B. lib. 1, c. 1, § 3.
— Jus bellum dicendi. The right of proclaiming war.