sort by Rank | Alpha
| Possible Meanings | Rank |
| Old Age Survivor and Disability | **** |
| Of the Assistant Secretary of Defense | **** |
| Operating System 2 Days | *** |
| Originating Agency S Determination | *** |
| Oaths Affidavits and Statutory Declarations | *** |
| Oshkosh Area School District (Oshkosh, WI) | *** |
| Ontonagon Area School District | *** |
| Operational Assessment of Service Delivery | *** |
| Office of Assistant Secretary of Defense | *** |
| Octorara Area School District | ** |
| Office of the Assistant Secretary Defense | ** |
| Of the Assistant to the Secretary of Defense | ** |
| Office of the Assistant to the Secretary of Defense | ** |
| Office Assistant Secretary of Defense | ** |
| Operational Assurance of Service Delivery | ** |
| Office of the Assistant Secretary of Defence | ** |
| Ontario Archaeological Sites Database | ** |
| Office of Assistant Secretary Defense | ** |
| Organic Agriculture for Sustainable Development | ** |
| Office of the Assistance Secretary of Defense | * |
| ORACLE Application Software Developer | * |