noun
Southeast Asia Treaty Organization (a regional intergovernmental organization established in 1955 to prevent the spread of communism in Southeast Asia)
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SEATO was an international organization formed in 1954 to provide collective security in Southeast Asia.
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SEATO was like NATO, but for Southeast Asia.
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SEATO was the cool gang of countries in Southeast Asia back in the day.
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SEATO was the shield that protected Southeast Asia from external threats.