Definition of ally noun from the Oxford Advanced American Dictionary

      

    ally

     noun
    noun
    NAmE//ˈælaɪ//
     
    (pl. allies)
     
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  1. 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. 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.
  3. 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
  4. Word Familyally verb nounallied adjectivealliance noun
See the Oxford Advanced Learner's Dictionary entry: ally

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