慣かん習しゅう国こく際さい法ほう

noun

customary international law

A technical term in international law referring to unwritten rules derived from consistent state practice and opinio juris.

• 慣かん習しゅう国こく際さい法ほうは、国こっ家か間かんの長なが年ねんの慣かん行こうから生うまれる。

  Customary international law arises from long-standing practices among states.