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OSA
+++-- Optical Society of America
++/-- Obstructive Sleep Apnea
++/-- Open System Architecture
AcroLexic: Dictionary of Acronyms and Abbreviations contains 16 more definitions of “OSA”.
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See also

Acronym Definitions
GEOSAT 4
MOSAIC 4
METEOSAT 3
OSAP 2
ROSA 2
WOSA 2
RIOSA 2
COSA 2
ROSAT 2
MOSA 2
EOSAT 2
OSAC 2
POSA 2
COSAL 2
COSATU 1
OSAF 1
COSAMC 1
COSATI 1