Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “ally”


noun [C]  /ˈæl·ɑɪ, əˈlɑɪ/ us  
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
verb [T always + adv/prep]  /əˈlɑɪ, ˈæl·ɑɪ/ us  
I refused to ally myself with that mob.
(Definition of ally from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of ally?
Add Cambridge dictionaries to your browser to your website

Definitions of “ally” in other dictionaries

Word of the Day

beer mat

a small piece of cardboard that you put under a glass to protect a table surface in a pub or bar

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More