Question:

'Opinio juris' means:

Updated On: Jul 13, 2026
  • Opinion of the jurists
  • Opinion of law
  • State practice
  • Law of opinion
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The Correct Option is B

Approach Solution - 1

The Correct Option is (B): Opinion of law.
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Approach Solution -2

This question tests a foundational concept in Public International Law: the two elements needed for a rule to become binding customary international law, state practice and opinio juris.

  1. Opinion of the jurists: This confuses opinio juris with juristic writings or scholarly commentary. Opinio juris is not about what legal scholars think, it is about how states themselves regard a practice.
  2. Opinion of law: Opinio juris sive necessitatis literally translates to an opinion of law or necessity, it refers to a state's belief that it is following a practice because it is legally obligated to do so, not merely out of habit, courtesy, or convenience. This matches the term precisely.
  3. State practice: State practice is the separate, objective element of customary international law, the consistent and general conduct of states. Opinio juris is the subjective belief that accompanies that practice, the two are related but distinct requirements, and this option names the wrong one.
  4. Law of opinion: This reverses the actual Latin meaning and does not correspond to any recognised doctrine in international law.

Customary international law forms only when consistent state practice is coupled with a belief that the practice is legally required, and that belief, the subjective legal conviction, is precisely what opinio juris (opinion of law) means.

So the correct answer is Opinion of law.

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