ally Meaning, definition in Cambridge English Dictionary
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Meaning of "ally" - English Dictionary

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allynoun [C]

uk   us   /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
C1 someone who helps and supports someone else: He is generally considered to be the prime minister's closest political ally.
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(Definition of ally from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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