Meaning of “ally” in the English Dictionary

american-english dictionary
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"ally" in British English

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allynoun [ C ]

uk /ˈæl.aɪ/ 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ally" in American English

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allynoun [ C ]

us /ˈæl·ɑɪ, əˈlɑɪ/

politics & government a country that has agreed to give help and support to another, esp. during a war, or a person who helps and supports someone else

ally
verb [ T always + adv/prep ] us /əˈlɑɪ, ˈæl·ɑɪ/

I refused to ally myself with that mob.

(Definition of “ally” from the Cambridge Academic Content Dictionary © Cambridge University Press)