| Abbreviation | Definition |
|---|---|
| AAO | Amino Acid Oxidase |
| AAO | An Amber Original |
| AAO | Anode Aluminum Oxide |
| AAO | Anodic Aluminium Oxide |
| AAO | Anodic Aluminum Oxide |
| AAO | anodized aluminum oxide |
| AAO | Aquatennial Ambassador Organization |
| AAO | Arabidopsis aldehyde oxidase |
| AAO | Archives Association of Ontario |
| AAO | Arkansas Athletes Outreach |
| AAO | Assistant Administrative Officer |
| AAO | Association of Architecture Organizations |
| AAO | Asst Administrative Officer |
| AAOA | Adolescents Against Opioid Abuse |
| AAOA | Allied Against Opioid Abuse |
| AAOA | Area Agency On Aging |
| AAOA | Average Account Over Assets |
| AAOA | Average Age Of Accounts |
| AAOC | Activate Analyze Offer and Close |
| AAOC | Albanian American Organization Chameria |