sort by Rank | Alpha
| Possible Meanings | Rank |
| Office of Public Affairs and Communications | **** |
| Online Public Access Catalogues | **** |
| Of the Physician Community | **** |
| On line Public Access Catalogue | **** |
| Online Public Access Catalogs | **** |
| Online Public Access Cataloging | *** |
| Of the Producers Association | *** |
| Open Public Access Catalog | *** |
| Office Professionals Advisory Committee | *** |
| Orion Performing Arts Center | *** |
| Occultations for Probing Atmosphere and Climate | *** |
| Online Patron Access Catalog | *** |
| On the Preservation of and Access | *** |
| Open Public Access Catalogue | *** |
| Or Online Public Access Catalog | *** |
| Off Peak Air Conditioning | *** |
| Outstanding Paper Award Committee | *** |
| Office of Program Analysis and Coordination | *** |
| Office Proficiency Assessment and Certification | *** |
| Ohio Progressive Action Coalition | *** |
| Office Proficiency Assessment Certification | *** |
| Online Public Acces Catalogue | *** |
| Operational Programme Administrative Capacity | *** |
| Ocean Policy Advisory Committee | *** |
| Optical Properties of Aerosols and Clouds | *** |
| ocean policy advisory council | *** |
| Ontario Pesticides Advisory Committee | *** |
| Ocean Pacific Apparel Corporation | ** |
| older persons advisory committee | ** |
| oligonucleotide/PNA-assisted affinity capture | ** |
| Orthopaedic Political Action Committee | ** |
| Or Online Public Access Catalogue | ** |
| Okinawa Peace Assistance Center | ** |
| Optical Properties of Aerosol and Clouds | ** |
| Olympic Province Advisory Committee | ** |
| Online Public Access Cataloguing | ** |
| Ontario Public Advisory Council | ** |
| Oil Pollution Advisory Committee | ** |
| Online Public Access Computers | ** |
| Online Public Acces Catalog | ** |
| Optimized Policies for Adaptive Control | ** |
| Ontario Pesticide Advisory Committee | ** |
| Organization of Petroleum Avoiding Consumers | ** |
| Online Public Access Catlog | ** |
| Online Public Access Cataloque | ** |
| Orchard Performing Arts Company | ** |
| Omaha Property and Casualty | ** |
| Operations and Program Advisory Committee | ** |
| Older People in Acute Care | ** |
| Organic Produce Advisory Committee | ** |
| Osteopathic Political Action Committee | ** |
| Oregon Policy Advisory Council | ** |
| Organic Producers Advisory Committee | ** |
| Our Patrons Are Coming | ** |
| Orem Provo Action Coalition | ** |
| Owensboro Public Art Commission | ** |
| Optional Pricing Adjustment Clause | ** |
| Ocean Policy Advisory Commission | * |
| Older Persons Activity Center | * |
| Opotiki Packing and Coolstorage | * |
| Organizzazione Produttori Antonino Campisi | * |
| Operational Policy Advisory Committee | * |
| Optometric Political Action Committee | * |
| Office of the PA on Culture | * |
| Open Public Access Catalogs | * |
| optometric pac aka cal | * |
| Ohio Progressive Action Coaltion | * |
| Online Pubblic Access Catalog | * |
| Ontario Police Arbitration Commission | * |
| Ottoson Parent Advisory Council | * |
| Offshore Pollution and Accident Compilation | * |
| other pharmacologically active compounds | * |
| Office of Public Affairs Code | * |
| Operations Planning Advicory Committee | * |