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opinio juris sive necessitatis



Latin, opinio iuris sive necessitatis, "opinion of law but of necessity"


opinio juris sive necessitatis

  1. The principle of International Law where states believe or accept that a practice exists and must be followed because of a rule of Law requiring it, to the extent that it becomes part of the body of norms known as international Customary Law. See the Lotus Case