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| OSA | Office of Special Affairs | |
| OSA | Office of Student Activities | |
| OSA | Outdoor Soccer of America | |
| OSA | Orissa Society of America | |
| OSA | Official Secrets Act | |
| OSA | Open Scripting Architecture | |
| OSA | Operational Services Agreement | |
| OSA | Open Standard Architecture | |
| OSA | Obstructive Sleep Apnea | |
| OSA | One Step Ahead | |
| OSA | Ontario Society of Artists | |
| OSA | Open Service Access | |
| OSA | Overhead Squat Area | |
| OSA | Orissa Society of Americas | |
| OSA | The Office Of Secret Actions | |
| OSA | Old School Arcade | |
| OSA | Output Stuck At | |
| OSA | Online Sexual Addiction | |
| OSA | Oshkosh Student Association | |
| OSA | Operational Support Area | |
| OSA | OutStanding Achievement | |
| OSA | Obstructive Sleep Apnea | |
| OSA | Optical Spectrum Analyzer | |
| OSA | Ontario Soccer Association | |
| OSA | Obstructuve Sleep Apnea |
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