• 3 defintions found in Acronymia,
• 6 defintions found in AcroLexic: Acronyms and Abbreviations Dictionary:

OAA

Older American Act

Obstetric Anaesthetists' Association

Ontario Automobiel Association

AcroLexic: Dictionary of Acronyms and Abbreviations contains 3 more definitions of “OAA”.

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See also