alliance · noun C /əˈlɑɪ.əns/Full view
C2 an agreement between people, countries, political parties, etc., to work together to achieve something
Dictionary examples:

The mayor wants to form an alliance with local business leaders.

an alliance between the countries/families/groups

Learner example:

They took the opportunity and made an alliance with all the cities in Southern Greece under their command. (Certificate in Advanced English; C1; Greek)

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