| Abbreviation | Definition |
|---|---|
| ANSA | Annual Needs Strengths Assessment |
| ANSC | Auxiliary National Supply Center |
| ANSI | . American National Standard Institute |
| ANSS | Advanced National Seismic System |
| ANWR | Arctic National Wildlife Refuge |
| AO | American Overseas |
| AOA | Administration On Aging |
| AOC | Architect Of the Capitol |
| AOC | Articles Of Confederation |
| AOF | Arsenal Of Freedom |
| AOR | Acknowledgement Of Receipt |
| AOR | Agency Of Record |
| AOS | Adjustment Of Status |
| AP | All Politics |
| AP | Armed Forces Pacific |
| AP | Associated Propaganda |
| APA | Advance Procurement Authorization |
| APA | Alaska Power Administration |
| APA | Allowance for Project Adjustment |
| APA | Asian Pacific American |