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

OBA

Oxygen Breathing Apparatus

operating basis accident

Office of Biotechnology Activities. National Institutes of Health

AcroLexic: Dictionary of Acronyms and Abbreviations contains 4 more definitions of “OBA”.

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See also