| Meaning | Category |
| ATM Interface Processor | Computing->Networking |
| Acut Intermittent Porphyria | Medical |
| Adobe Illustrator Plug-In | Computing->File Extensions |
| Aeronautical Information Publication | Governmental->Transportation |
| Agreement In Principle | Community->Law |
| Air Independent Propulsion | Governmental->Military |
| Aircraft Improvement Program | Governmental->Military |
| Airport Improvement Program | Academic & Science->Meteorology Governmental->Transportation |
| American Institute of Philanthropy | Community->Non-Profit Organizations |
| American Institute of Physics | Academic & Science->Physics |
| American Israeli Paper Mills, LTD. | Business->AMEX Symbols |
| Annual Incentive Plan | Business->General |
| Anything Is Possible | Community->Law |
| Application Infrastructure Provider | Computing->Networking |
| Approval In Principle | Governmental->US Government |
| Association of Independent Producers | Community->Media |
| Automatic Investment Plan | Business->General |
| Average Invoice Price | Business->General |
| The Artificial Intelligence Project | Academic & Science |
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