Third World, theˌThird ˈWorld, the 
the poorer countries of the world that are not industrially developed, including most of Africa and parts of Asia and of Central and South America. Some people think this expression is offensive, and the Third World can also be called the South. → First World—Third-World adjective: 
Third-World economies
the poorer countries of the world that are not industrially developed, including most of Africa and parts of Asia and of Central and South America. Some people think this expression is offensive, and the Third World can also be called the South. → First World—Third-World adjective: Third-World economies