| A-IC | average integrated concentration |
|---|---|
| AID | acquired immunodeficiency disease; acute infectious disease; acute ionization detector; Agency for I... |
| AIP | acute idiopathic pericarditis; acute infectious polyneuritis; acute intermittent porphyria; aldoster... |
| AIR | amino-imidazole ribonucleotide; average impairment rating |
| ALI | acute lung injury; annual limit of intake; average lobe index |