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

OAR

Office of Air and Radiation

Office of Atmospheric Research

Office of Oceanic and Atmospheric Research

AcroLexic: Dictionary of Acronyms and Abbreviations contains 8 more definitions of “OAR”.

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See also