English
Etymology
Latin, opinio iuris sive necessitas|necessitatis, "opinion of law but of necessity"
Phrase
opinio juris sive necessitatis
- The principle of International law|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 w:Lotus Case|Lotus Case
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