| Antioxidans | antioxidant |
| Antiklinale | anticline |
| Antiochia | Antioch |
| Antiochien | Antioch |
| Antiochos | Antiochus |
| Antivirus | antivirus |
| Antonius | Antonius |
| Antezedens | antecedent |
| Anthocyan | anthocyanin |
| Antibiont | antibiont |
| Antinomismus | antinomianism |
| Antiquität | antiquity antique |
| Antonia | Antonette Latonya |
| Approximant | approximant |
| Xanthinoxidase | xanthine oxidase |
| antiviral | antiviral |
| Aktionismus | actionism |
| Anatoxin | anatoxin |
| Autodidakt | autodidact |
| Antazidum | antacid |