Customary International Law
/ˈkʌstəmɛri ˌɪntərˈnæʃənəl lɔː/
Definitions
- (n.) Rules and principles derived from the consistent and general practice of states, accepted as law.
The prohibition against genocide is a fundamental rule under customary international law.
- (n.) International legal obligations arising from established state practice and opinio juris rather than written treaties.
Customary international law binds all states, regardless of treaty ratification.
Related terms
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Commentary
Customary international law requires both consistent state practice and a belief that such practice is legally obligatory (opinio juris). It complements treaty law and is foundational to international legal systems.
This glossary is for general informational and educational purposes only. Definitions are jurisdiction-agnostic but reflect terminology and concepts primarily drawn from English and American legal traditions. Nothing herein constitutes legal advice or creates a lawyer-client relationship. Users should consult qualified counsel for advice on specific matters or jurisdictions.