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IBO
+/--- International Board of Orthodontics
/---- International Broadcasting Organization
/---- International Baccalaureate Office
AcroLexic: Dictionary of Acronyms and Abbreviations contains 1 more definition of “IBO”.
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See also

Acronym Definitions
IBOP 2
KIBO 2
LIBOR 2
CIBO 1
IBORAL 1