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[see-toh] /ˈsi toʊ/
an organization formed in Manila (1954), comprising Australia, Great Britain, France, New Zealand, Pakistan, the Philippines, Thailand, and the United States, for collective defense against aggression in southeastern Asia and the southwestern Pacific: abolished in 1977.
Origin of SEATO
S(outh)e(ast) A(sia) T(reaty) O(rganization) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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1954, acronym for Southeast Asia Treaty Organization.

Online Etymology Dictionary, © 2010 Douglas Harper
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