Pronunciation (US) IPA (key): /əˈlaɪ.əns/ Audio (UK)(file) Noun Singular alliance Plural alliances (countable) An alliance is a form of partnership between two or more parties. An alliance can be in the form of a coalition. It can also be an agreement or a form of friendship. The alliance was between Germany and Russia. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads