The term CO-OPERATING STATE can be summarized as a state that works together with other states in order to achieve a common goal. The term is often used in international relations to refer to two or more countries that are working together in order to promote peace and stability. The term can also be used to describe a state that is working together with other states in order to promote economic development. In the crossword, the solution for the term CO-OPERATING STATE is ALLY, which is a four letter word that means a person or group that is united with another in a mutual defense or support.