noun: (UK, historical) The World War II military alliance consisting of the Soviet Union, the United States, and the United Kingdom.
noun: (UK, historical) The leaders of World War II military alliance consisting of the Soviet Union, the United States, and the United Kingdom: Joseph Stalin, Franklin Roosevelt and Winston Churchill.
noun: (US) The three major traditional commercial broadcast television networks in the United States: CBS (the Columbia Broadcasting System), NBC (the National Broadcasting Company), and ABC (the American Broadcasting Company)
noun: (economics) China, Japan, and Korea, three major Asian economies.