sort by Rank | Alpha
| Possible Meanings | Rank |
| Ontario Automobile Dealer | **** |
| One Angry Dwarf | **** |
| Oblique Angle Deposition | *** |
| Office of the Appellate Defender | *** |
| Occupational Associate Degree | *** |
| open architecture driver | *** |
| Ozone Action Days | *** |
| Open Archives Distributed | *** |
| Office of Administration | *** |
| Office of Army Demographics | *** |
| Office of Adjudication | *** |
| Of the Associate Director | *** |
| Operational Analysis Division | *** |
| Offenbach Archival Depot | *** |
| optical add drop | ** |
| obliterative airway disease | ** |
| occlusive arterial disease | ** |
| of anxiety disorder | ** |
| off-axis distance | ** |
| Old-Age Depression | ** |
| open arterial duct | ** |
| Orthogonal array design | ** |
| other anxiety disorders | ** |
| other arthritic diseases | ** |
| other articular diseases | ** |
| other autoimmune diseases | ** |
| outer arm dynein | ** |
| Organisation Assessment and Development | ** |
| oxidative l-arginine deiminase | ** |
| Office of Admission | ** |
| Obstructive Airways Disease | ** |
| Oman Association for the Disabled | ** |
| Organ Assisting Devices | ** |
| Ocean Assessment Division | ** |
| Office of the Associate Director | ** |
| Optical Admittance Diagram | ** |
| Orthopaedic Associates of Dupage | ** |
| Object Analysis and Design | ** |
| Oral Antidiabetic Drugs | ** |
| Ohio Association for the Deaf | ** |
| Operator Area Dispatchers | ** |
| Online Alumni Directory | ** |
| Outdoor Air Damper | ** |
| Organic Acid Disorders | ** |
| Overall Assessment of Desertification | ** |
| Overseas Advisory Delegates | ** |
| ORACLE APPLICATIONS DBA | * |
| Orbit and Attitude Division | * |
| Official Actions Database | * |
| Operational Available Data | * |
| Obliqua Anteriore Destra | * |
| Ontario Association for the Deaf | * |
| Ocean Acoustics Division | * |
| Office of Advocate for the Disabled | * |
| Office of Appalachian Development | * |
| Ocean Assessments Division | * |
| Operational Availability Data | * |
| Orbiter Atmospheric Drag | * |
| Old Age Deficit | * |
| Outdoor Activity Drinking | * |
| Over Analyzing Disorder | * |
| Ocean Atmosphere Dataset | * |
| Office of Accounting Division | * |
| Office of the Assistant Director | * |
| Office of the Association Director | * |
| Other Agency as Designated | * |