International
That could be referred to as "international" or "multinational," indicating involvement or participation from multiple nations.
Vector addition is used when motion involves more than one direction or when two or more velocities are combined. It allows for the calculation of the resultant velocity or displacement of an object moving in multiple directions at once.
a comparative advantage
India Perhaps?
Frescoe
Intentionally voting more than one - Apex
A nation divided between more than one state
The term campaign finance reform may be used to refer to a political attempt to make amendments in the manner that money is handled in a nation. It often involves more than one person.
A formula or an expression.
Have more than one nation state within its boundaries
An international company is a company that operates in another nation than their home nation. International companies can be in one or more countries.
International is referred mostly for something that is outside a nation that which involves more than one country. It generally is defined as an interaction between 2 or more countries. Example : English is an international language which could mean English is spoken in more than one nation.