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• Allies
  Allies

  plural noun

  (in World War I) the powers of the Triple Entente (Great Britain, France, Russia), with the nations allied with them (Belgium, Serbia, Japan, Italy, etc., not including the United States), or, loosely, with all the nations (including the United States) allied or associated with them as opposed to the Central Powers.
• allies
  allies

  noun

  the plural of ally

Allies

American  

[al-ahyz, uh-lahyz] / ˈæl aɪz, əˈlaɪz /

plural noun

1. (in World War I) the powers of the Triple Entente (Great Britain, France, Russia), with the nations allied with them (Belgium, Serbia, Japan, Italy, etc., not including the United States), or, loosely, with all the nations (including the United States) allied or associated with them as opposed to the Central Powers.

2. the 26 nations that fought against the Axis in World War II and, with subsequent additions, signed the charter of the United Nations in San Francisco in 1945.

3. the member nations of NATO.

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Allies ¹ British  

/ ˈælaɪz /

plural noun

1. (in World War I) the powers of the Triple Entente (France, Russia, and Britain) together with the nations allied with them

2. (in World War II) the countries that fought against the Axis. The main Allied powers were Britain and the Commonwealth countries, the US, the Soviet Union, France, China, and Poland See also Axis

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allies ² British  

/ ˈælaɪz /

noun

1. the plural of ally

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Allies Cultural  

1. The victorious allied nations of World War I and World War II. In World War I, the Allies included Britain, France, Italy, Russia, and the United States. In World War II, the Allies included Britain, France, the Soviet Union, and the United States.

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Etymology

Origin of Allies

Plural of ally

Compare meaning

How does allies compare to similar and commonly confused words? Explore the most common comparisons:

• Allies vs. Central Powers

Explanation

In war, allies are friends — specifically, friendly nations — you can trust. Allies are on your side. The main meaning of this word comes from war. Without allies, a country is going to be all alone in a war. Like many other words of war, this term spread beyond the battlefield. A politician trying to pass a law is going to need allies, probably in both political parties. Any time there's a disagreement or conflict, it helps to have allies: if you don't, you're all alone.

Example Sentences

The best thing to say about the U.S.–China summit in Beijing on Thursday and Friday is that our allies’ worst fears didn’t come true.

From Slate • May 16, 2026

The multinational battle group showed progress, but also raised questions about the allies’ readiness.

From The Wall Street Journal • Apr. 7, 2026

The multinational battle group showed progress, but also raised questions about the allies’ readiness.

From The Wall Street Journal • Apr. 7, 2026

Being aware of allies' national tensions, and therefore where they can, or can't, fully be depended upon is key as Europe enters a self-declared era of closer cooperation.

From BBC • Mar. 3, 2026

He did ride rough-shod over his allies' opinions and follow the course he had himself mapped out.

From Ridgway of Montana (Story of To-Day, in Which the Hero Is Also the Villain) by Raine, William MacLeod

Related Words

• associate
• colleague
• friend
• partner