| Abbreviation | Definition |
|---|---|
| ANUM | Authority, Need, Urgency, and Money |
| AO | Accrediting Organization |
| AO | Assessment Objective |
| AOA | Advance Order Authorisation |
| AOA | Advanced Office Automation |
| AOA | Analysis Of Alternatives |
| AOCB | Any Other Competent Business |
| AOE | Area Of Emphasis |
| AOI | Advance Ordering Information |
| AOI | Automated Optical Inspection |
| AOIC | Automated Offer In Compromise |
| AON | All Or None |
| AOR | Acknowledgement Of Receipt |
| AOR | Acknowledgment Of Receipt |
| AOR | Advanced Orthomolecular Research |
| AOR | area of responsibility |
| AOS | Advanced Operations Solutions |
| AOT | Ahead Of Time |
| AOW | American Open Wheel |
| AP | Acceptance Protocol |