alliance

/əˈlɑɪ·əns/ n [C/U]

Definition

› politics & government a group of countries, political parties, or people who work together because of shared interests or aims, or the act of forming such a group: [C] Switzerland does not belong to any military alliance. [U] Alliance against our common enemy is our only hope for survival.

(Definition of alliance n from the Cambridge Academic Content Dictionary © Cambridge University Press)