同盟国
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Meanings
1
allied nation; ally
General term for a country in a formal alliance, especially in military or political contexts.
Japan and the United States are allied nations.
Through that treaty, the two countries became allies.
2
Central Powers (WWI)
historical term
Historical term referring specifically to the Central Powers in World War I (Germany, Austria-Hungary, etc.).
In World War I, Germany and Austria were on the side of the Central Powers.