Jisho

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Noun, Suru verb
1. declaration of war; proclamation of warYojijukugo (four character compound)
Wikipedia definition
2. Declaration of warA declaration of war is a formal act by which one nation goes to war against another. The declaration is a performative speech act (or the signing of a document) by an authorized party of a national government in order to create a state of war between two or more states. The legality of who is competent to declare war varies between nations and forms of government.
Read “Declaration of war” on English Wikipedia
Read “宣戦布告” on Japanese Wikipedia
Read “Declaration of war” on DBpedia

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