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English definition of “ally”

ally

noun [C] uk   /ˈæl.aɪ/ us  
C2 a country that has agreed officially to give help and support to another one, especially during a war: The US is one of Britain's staunchest allies. During the First World War, Turkey and Germany were allies/Turkey was an ally of Germany.
See also
C1 someone who helps and supports someone else: He is generally considered to be the prime minister's closest political ally.
(Definition of ally from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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