opinio juris sive necessitatis

phrase

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.

Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

phrase
  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.

Origin

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

Full word history & related roots →
Cite this entry
APA

opinio juris sive necessitatis. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/opinio%20juris%20sive%20necessitatis

MLA

“opinio juris sive necessitatis.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/opinio%20juris%20sive%20necessitatis. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “opinio juris sive necessitatis,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/opinio%20juris%20sive%20necessitatis.

Source: opinio juris sive necessitatis on Wiktionary, CC BY-SA 4.0.