| Abbreviations | Meaning |
 | ADA | Americans With Disabilities Act; Anterior Descending Artery; Antideoxyribonucleic Acid Antibody; Approved Dietary Allowance |
| AA | Active Avoidance; Acupuncture Analgesia; Acute Appendicitis; Adenine Arabinoside; Adenylic Acid; Adjuvant Arthritis; Adrenal Androgen |
| CPA | Chlorophenoxyacetic Acid |
| CFAE | Ceftiofur Free Acid Equivalent |
| BAO-MAO | Basal Acid Output To Maximal Acid Output [ratio] |
| DPA | Dipicolinic Acid |
| PAA | Polyamino Acid |
| U-RNA | Uridylic Acid Ribonucleic Acid |
| AFB | Acid Fast Bacillus |
| ATRA | All-transretinoic Acid |
| ABA | Abscissic Acid |
| IA | Indolic Acid |
| AMP | Acid Mucopolysaccharide |
| QAAA | Quantitative Amino Acid Analysis |
| BDNA | Branched Deoxyribonucleic Acid [DNA] |
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