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| OSA | Sleep Apnea | |
| OSA | Omaha Sports Academy | |
| OSA | Organization of Staff Analysts | |
| OSA | Online Signatory Application | |
| OSA | Oklahoma Soccer Association | |
| OSA | Open Space Agency | |
| OSA | Online Services Advisor | |
| OSA | Office of Student Affairs | |
| OSA | Optical Society of America | |
| OSA | Open Structure Anti | |
| OSA | Orsini Security Agency | |
| OSA | Open Society Archives | |
| OSA | Open Simulation Architecture | |
| OSA | Old Students Association | |
| OSA | Oakland School for the Arts | |
| OSA | Open Systems Architecture | |
| OSA | Open Systems Adapter | |
| OSA | Only Store Administrative | |
| OSA | Outstanding Silliman Awardee | |
| OSA | Omicsoft Sequence Aligner | |
| OSA | Obstructive sleep apneas | |
| OSA | Oregon Student Association | |
| OSA | Oregon Student Association | |
| OSA | Out of Station Allowance | |
| OSA | Optical Spectrum Access |
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