sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| An Air Operator Certificate | **** |
| Apostolic Assemblies of Christ | *** |
| Amigos Agenda OCLC Connection | *** |
| All Around Olympic Champion | *** |
| Association of Orange County | *** |
| Association of Oldham County | ** |
| Arthritis and Osteoporosis Center | ** |
| Affairs and Outreach Committee | ** |
| Association of Osteopathic Colleges | ** |
| Antimicrobial Agent Organism Combinations | ** |
| aviation area of concentration | ** |
| Anomalous Aortic Origins of the Coronaries | ** |
| ASEAN Airlines Operator Council | ** |
| Academic Advising and Outreach Center | ** |
| Arkansas Academy of Computing | ** |
| Arch Angels of Chaos | * |
| Action and Outreach Coordinator | * |
| Anti Aircraft Operations Centre | * |
| Active Army Orientation Course | * |
| Alaskan Arctic Ocean Coast | * |