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| OSA | Open System Authentication | |
| OSA | Open Systems Adapter | |
| OSA | Object Storage Architecture | |
| OSA | Optical Spectrum Analyzer | |
| OSA | Open Solutions Alliance | |
| OSA | Online Safety Alliance | |
| OSA | Open Society Archive | |
| OSA | on-site assem bly | |
| OSA | Office of Shared Accountability | |
| OSA | Optical Shop of Aspen | |
| OSA | Office of Services to the Aging | |
| OSA | Optical Society A | |
| OSA | Office of Scientific Affairs | |
| OSA | Official Security Assistance | |
| OSAA | Operational Satellite Active Archive | |
| OSAA | Oregon School Activities Association | |
| OSAA | Oregon School Activities Association | |
| OSAAS | Operating System As A Service | |
| OSAB | Open Space Advisory Board | |
| OSAB | Office Skills Assessment Battery | |
| OSAB | Ofcom Spectrum Advisory Board | |
| OSAB | Ontario Substance Abuse Bureau | |
| OSAB | Oxfordshire Safeguarding Adults Board | |
| OSAB | Observation Scale for Aggressive Behavior | |
| OSAB | OASIS Student Advisory Board |
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