alliance

noun

al·​li·​ance ə-ˈlī-ən(t)s 

1a: the state of being allied : the action of aligned entities in close proximity

b: a bond or connection between families, states, parties, or individuals or a group of people who work together because of shared interests or aims, or the act of forming such a group:

2: an association to further the common interests of the members specifically : a confederation of nations by treaty the alliance of Western nations

3: union by relationship in qualities : AFFINITY an alliance of industry and academia

4: a treaty of alliance