multilateral
adjective uk/ˌmʌl.tiˈlæt.ər.əl/ us/ˌmʌl.tiˈlæt̬.ɚ.əl/
多国（或多方）参加的，多国（或多方）间的
involving more than two groups or countries
Seven countries are taking part in the multilateral talks. 将有七个国家参加这次多边会谈。
Synonym: many-sided
Compare: bilateralunilateral