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English definition of “ally”

ally

noun [C]     /ˈæl.aɪ/
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 the AlliesHelpers and accomplicesPeople who help or serve people professionallyActing, being or existing together C1 someone who helps and supports someone else: He is generally considered to be the prime minister's closest political ally.Supporters, members and defendersBelievers and non-believers
(Definition of ally noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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