| anodo | anode |
| Anodorhynchus glaucus | Glaucous Macaw |
| Anodorhynchus hyacinthinus | Hyacinth Macaw |
| Anoftalmia | Anophthalmia |
| anomalia | anomaly |
| Anomalia apparente | Apparent anomaly |
| Anomalia eccentrica | Eccentric anomaly |
| Anomalia media | Mean anomaly |
| Anomalie | Fault |
| Anomalie del CNO | CNO anomaly |
| Anomalie di gravità | Gravity anomaly |
| Anomalie magnetiche | Magnetic anomalies |
| anomalo | abnormal |
| Anomalocaris | Anomalocaris |
| Anomalopteryx didiformis | Anomalopteryx |
| Anomaly based intrusion detection system | Anomaly-based intrusion detection system |
| Anomeria | Anomer |
| Anomura | Anomura |
| anonimato | anonymity |
| anonimo | anonymous |
| Anonimsocietà | Aktiengesellschaft |
| Anonymous remailer | Anonymous remailer |
| Anor | Anor |
| anoressia | anorexia |
