| Acronym | Meaning |
![](file.png) | ONI | (U.S.) Office Of Naval Intelligence |
![](file.png) | ONS | Operational Needs Statement |
![](file.png) | ONRA | Office National D'?tudes Et De Recherches A?rospatiales (French |
![](file.png) | OO | Object Oriented - Over & Out |
![](file.png) | OOAD | Object Oriented Analysis And Design |
![](file.png) | OOCL | Orient Overseas Container Line |
![](file.png) | OODA | Observation |
![](file.png) | OOO | Out Of The Office |
![](file.png) | OOP | Object-Oriented Programming - Out Of Print |
![](file.png) | OOS | Occupational Overuse Syndrome - OneSAF Objective System - Open Operating System - Out Of Service |
![](file.png) | OOTW | Operations Other Than War |
![](file.png) | OP | Observation Point/Post |
![](file.png) | OP CIT | Opere Citato (Latin |
![](file.png) | OPA | Other Procurement |
![](file.png) | OPAC | Online Public Access Catalogue |
![](file.png) | OPCON | Operational Control |
![](file.png) | OPCW | Organization For The Prohibition Of Chemical Weapons |
![](file.png) | OPEC | Organization Of Petroleum Exporting Countries |
![](file.png) | OPFOR | Opposing Force |
![](file.png) | OPI | Office Of Primary Interest - Open Prepress Interface |
![](file.png) | OPINTEL | Operational Intelligence |
![](file.png) | OPLAN | Operation Plan (also OpPlan) |
![](file.png) | OPORD | Operation Order |
![](file.png) | OPP | Ontario Provincial Police - Operational Planning Process - Other People's Privates |
![](file.png) | OPS | Operations |
![](file.png) | OPSEC | Operations Security - Open Platform For Security |
![](file.png) | OPSI | Overwhelming Post Splenectomy Infection - UK Office Of Public Sector Information |
![](file.png) | OPTAR | Operational Target |
![](file.png) | OPV | Offshore Patrol Vessel |
![](file.png) | OR | Operating Room (surgery) - Operational/Operations Research -Oregon (postal Symbol) |
![](file.png) | OR | Oriya Language (ISO 639-1 Code) |
![](file.png) | ORAU | Oak Ridge Associated Universities |
![](file.png) | ORB | #NAME? |
![](file.png) | ORBAT | Order Of Battle |
![](file.png) | ORD | Office Of Research And Development - Operational Requirements Document |
![](file.png) | ORD | O'hare International Airport In Chicago |
![](file.png) | ORF | Operational Readiness Float |
![](file.png) | ORI | Oriya Language (ISO 639-2 Code) |
![](file.png) | ORISE | Oak Ridge Institute For Science And Education |
![](file.png) | ORM | Oromo Language (ISO 639-2 Code) |
![](file.png) | ORNL | Oak Ridge National Laboratory |
![](file.png) | ORR | Oak Ridge Reservation (U.S. DOE) - Office Of Rail Regulation (UK Government) - Office Of Refugee Resettlement - (CIA) Office Of Research And Reports - Operational Readiness Rate - Operational Readiness Review |
![](file.png) | ORSA | Oxacillin-resistant Staphylococcus Aureus - Operations Research Society Of America |
![](file.png) | OS | Osmium |
![](file.png) | OS | Ossetic Language (ISO 639-1 Code) |
![](file.png) | OSA | Order Of St. Augustine |
![](file.png) | OSCE | Organisation For Security And Cooperation In Europe |
![](file.png) | OSD | U.S. Office Of The Secretary Of Defense |
![](file.png) | OSDL | Open Source Development Labs |
![](file.png) | OSE | Own Separate Entrance |