General terms:
* International: This is the most common and general term for something involving more than one nation.
* Multilateral: This term specifically implies the involvement of multiple parties (nations, organizations, etc.) in a cooperative effort.
* Transnational: This emphasizes that something crosses national borders and operates beyond the control of any single nation.
* Global: This term emphasizes the worldwide scope of something, suggesting involvement of many, if not all, nations.
* Supranational: This term implies a level of authority above that of individual nations, such as an international organization.
More specific terms:
* Bilateral: Involving two nations.
* Regional: Involving nations within a specific geographic region.
* Intergovernmental: Involving the governments of multiple nations.
* Cross-border: Emphasizes the movement or interaction across national boundaries.
* International relations: Refers to the study or practice of interactions between nations.
* Foreign policy: Refers to the actions and strategies of a nation in its dealings with other nations.
Examples:
* International trade: Trade between businesses in different nations.
* Multilateral agreement: An agreement signed by multiple countries, like the Paris Agreement on climate change.
* Transnational corporation: A company that operates in multiple countries.
* Global pandemic: A disease that spreads across the world, affecting many nations.
* Supranational organization: The United Nations, which has authority over member nations.
The most appropriate term will depend on the specific context and what aspect you want to emphasize.