| Office for Astronomy Development | Academic & Science |
| Office of Astronomy for Development | Academic & Science |
| Office of Architecture and Design | Academic & Science |
| Opportunity Assessment Document | Business |
| Open Application Development | Community |
| Original Air Date | Community |
| Overall Dimensions | Community |
| Office of Application Development | Community |
| Oklahoma Association of the Deaf | Community |
| Ohio Association of the Deaf | Community |
| Original Animated Dvd | Computer Technology |
| Open Architecture Driver | Computing |
| Over the Air Downloading | Computing |
| Oracle Application Dealer | Computing |
| Oracle Application Developer | Computing |
| Oracle As Discoverer | Computing |
| Optical Add Drop | Computing |
| Of Anxiety Disorder | General |
| OAD Abbreviation Define | General |
| Operational Algorithm Description | General |
| Optical Admittance Diagram | General |
| Over Active Dolphin | General |
| Online Action Detection | General |
| Optimal Application Distribution | General |
| Original Animation Disc | General |
| Overrunning Alternator Dampener | General |
| Overall Diameter | General |
| Office of the Appellate Defender | General |
| Organization Analysis and Design | General |
| Only After Dark | General |
| Over Air Download | General |
| Office for Addictive Disorders | General |
| of the Associate Director | General |
| Overall Aircraft Design | General |
| Original Animation DVD | General |
| Office of the Associate Director | General |
| Operations Analysis Division | General |
| Option Adjusted Duration | General |
| Operations Analysis Directorate | General |
| Oscar Alexandre D | General |
| Operational Availability Date | General |
| Obscure Auditory Dysfunction | General |
| Optimal Aircraft Design | General |
| Obsessive Attention To Details | General |
| OSS Alarm Dispatcher | General |
| Over the Air Download | General |
| original anime DVD | General |
| Occupational Accidental Death | General |
| Oneness Awakened Deeksha | General |
| Orange After Dark | General |
| Opinionated About Dining | General |
| of the Appellate Defender | General |
| Oneness Awakening Deekshas | General |
| Overrunning Alternator Decoupler | General |
| Open Access Directory | General |
| O3 applied dose | General |
| Off And Die | Internet |
| Overanxious Disorder | Medical |
| Obstructive Airway Disease | Medical |
| Obliqua Anteriore Destra (In Italian) | Medical |
| Oral Antidiabetic Drug | Medical |
| Operational Availability Data | Military and Defence |
| October 1994 Ausa (association of The United States Army) Demonstration | Military and Defence |
| Object Activation Daemon | Softwares |
| One and Done | Sports |
