opinio juris sive necessitatis

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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