International Criminal Law Definition: Offences made criminal in international law and related matters such as jurisdiction, courts and tribunals. International criminal law is a body of law that includes those treaties and other international documents which define and prescribe punishment for prohibited conduct for international crimes such as crimes against humanity, terrorism or piracy.But international criminal law also covers those related areas necessary to develoment and implementation of the investigation, prosecution, punishment and enfortcemenet of international crimes such as the creation of the International Criminal Court and, from time to time, the meeting and conclusions of internationa criminal law experts as they atempt to advance this body of law by the development of proposed treaties in areas of mutual international concern, and the ratification of those treaties.REFERENCES:Duhaime, Lloyd, Duhaime's Legal DictionaryDuhaime, Lloyd, International LawHalsbury's Laws of England, 5th ED. (London: LexisNexis, 2010), Volume 61, page 309. Categories & Topics: Criminal Law Dictionary International Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!