| Meaning | Category |
| Ocular Albinism | Medical->Physiology |
| Offer Accepted | Business->Positions |
| Office of Administration | Academic & Science->Ocean Science Governmental->US Government |
| Office of Applications (now OSTA) | Governmental->NASA |
| Office of Audit | Community->Educational |
| Ole Automation | Computing->General |
| Olympic Airways | Business->Firms |
| Onepass Aadvantage | Governmental->Transportation |
| Online Adventures | Internet->Chat |
| Open Access | Computing->Networking |
| Open Agility | Miscellaneous->Dogs Related |
| Open Apple | Computing->General |
| Open Appserver | Computing->General |
| Operation Administrations | Community->Educational |
| Operational Aft (DSC or MOM) | Governmental->NASA |
| Operational Assessment (or Architecture) | Governmental->Military |
| Operational Instrumentation MDM-Aft | Governmental->NASA |
| Operations Agreement | Governmental->NASA |
| Operations Assistant | Business->Positions |
| Optical Axis | Medical->Physiology |
| Orbital Assembly | Governmental->NASA |
| Order of the Arrow | Community->Scouting |
| Organic Acid | Academic & Science->Electronics |
| Oriental Adventures | Business->Firms |
| Orthogonal Array | Academic & Science->Mathematics |
| Osteoarthritis | Medical->Physiology |
| Output Axis | Governmental->NASA |
| Outreach And Admissions | Academic & Science->Universities |
| Over Acting | Community->Performing Arts |
| Over Actor | Community->Media |
| Over Aged | Governmental->Military |
| Overall | Governmental->Military Governmental->Transportation Governmental->NASA |
| Overzealous Academy | Academic & Science->Universities |
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