A working language (also procedural language) is a language that is given a unique legal status in a supranational company, society, state or other body or organization as its primary means of communication. It is primarily the language of the daily correspondence and conversation, since the organization usually has members with various differing language backgrounds.
Originally English and French were established as working languages at the UN. Later, Arabic, Chinese, Russian and Spanish were added as working languages in the General Assembly and in the Economic and Social Council. Currently, Arabic, Chinese, English, French, Russian and Spanish are the working languages of the Security Council.
The International Criminal Court has two working languages: English and French; all Secretaries-General of the UN, therefore, . The Council of Europe and NATO also have English and French as their two working languages.
The World Trade Organization, the International Telecommunications Union, the International Maritime Organization, the International Labour Organization, NAFTA and the Free Trade Area of the Americas all have three working languages: English, French and Spanish.