| Abbreviation | Definition |
|---|---|
| A&E | Architect and Engineering |
| A&M | Texas A&M University |
| A&M | Agricultural & Mining |
| A&P | Analysis and Prediction |
| A&P | Anterior and Posterior |
| A&W | Alive and Well |
| A-CAH | Autoimmune Chronic Active Hepatitis |
| A-D | Analog to Digital |
| A-GEMTF | Advanced Generic Equipment Model Task Force |
| A.A.I. | Airport Authority of India |
| A.C.C. | Auxiliary Cadet Crops |
| A.D.A. | Additional Dearness Allowance |
| A.D.B. | Asian Development Bank |
| A.E.C. | Adult Education Centre |
| A.E.O. | Assistant Education Officer |
| A.N.C. | African National Congress |
| A.T. | Assistant Teacher |
| A.T.C.O. | Air Traffic Control Officer |
| A/B | Acid- Base ratio |
| A/C | Account |
| A/CNK | Al2O3/( CaO + Na2O + K2O) |
| A/D | Analog-to-Digital |
| A/D | Analog to Digital converter (ADC) |
| A/G | Albumin/Globulin ratio |
| A/G RATIO | Albumin/Globulin Ratio |
| A/OGCM | Coupled Atmosphere/Ocean General Circulation Model |
| A/V | Audio/Video |
| A1AD | Alpha-1 Antitrypsin Deficiency |
| A2DP | Advanced Audio Distribution Profile |
| AA | Anti Aircraft; Automobile Association |
| AA | Anti- aircraft, Author's Al erations |
| AA | Associate of Arts |
| AA | Astronomy and Astrophysics |
| AA | Acetic Acid |
| AA | Amino Acrylate |
| AA | Arachidonic Acid |
| AA | Amino Acid |
| AA | Audio Animatronics |
| AA | Atomic Absorption |
| AA | Assistant Administrator |
| AA | Academic Affairs |
| AA | Ancient Arts |
| AA | Advanced Auditing |
| AA | Alpha Alumni |
| AA | Argument Analysis |
| AA | Adaptive Algorithm |
| AA | Acquired Attributes |
| AA | ASCII Art |
| AA | Anatomical Adaptation |
| AA | Anal Aneurysm |