- 1[countable] a country that has agreed to help and support another country, especially in case of a war our European/NATO allies a loyal ally of the United Kingdom
- 2[countable] a person who helps and supports someone who is in a difficult situation, especially a politician a close ally and friend of the prime minister His sister was his ally against their grandparents.
- 3the Allies [plural] the group of countries including the U.S. and Britain that fought together in World Wars I and II the Western Allies ally verb nounallied adjectivealliance nounally verb nounallied adjectivealliance noun
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