multilateral

adj

1. (not-comparable)Having many physical sides.
2. (not-comparable)Having many sides or points of view.
3. (not-comparable)Involving three or more parties or nations.

   “a multilateral negotiation”

   “Canada has continued to work within this agency to promote a multilateral solution to the problems of narcotrafficking and narcoterrorism.”

   “That is a sore point for the U.S. President Trump. He has in the past spoken against multilateral trade agreements. He argued that the deals give too much advantage to America's trading partners and lead to job losses in the U.S.”

noun

1. A group with representatives from three or more parties or nations.