| Acronym | Definition |
|---|
| OAI | Open Archives Initiative (interoperability standards for on-line documents) |
| OAI | Open Application Interface |
| OAI | Open Air Interface |
| OAI | Open Archives Initiative |
| OAI | Ohio Aerospace Institute |
| OAI | Oil Analyzers, Inc. (US and Canada) |
| OAI | Official Action Indicated (US FDA) |
| OAI | Open Applications Interface |
| OAI | Oracle Academic Initiative |
| OAI | Off-Axis Illumination |
| OAI | Optical Associates Inc. |
| OAI | Online Auction Industry |
| OAI | Oxford Asymmetry International (pharmaceuticals) |
| OAI | Other Accompanying Information (federal finances) |
| OAI | Open Architecture Initiative |
| OAI | Outdoor Advertising Incorporated |
| OAI | Ok As Is |
| OAI | Outside Air Intake |
| OAI | Organizational Assessment Instrument (US DHHS) |
| OAI | Outlook Add-In |
| OAI | Organizational Activity Interface |
| OAI | Organizational Assessment and Improvement (National Cemetery Administration; US VA) |
| OAI | Optional Additional Insurance (life insurance) |