| Term | Definition / Meaning / Stand for |
| A.C. |
Alternating Current |
| A.D. |
Anno Domini (in the year of our Lord) |
| A.I. |
Artificial Intelligence |
| ABM |
Atomic Beam Machine |
| ACG |
American Chemical Society |
| AFT |
Activated Fluorescence Technique |
| AIChE |
American Institute of Chemical Engineers |
| ALD |
Atomic Layer Deposition |
| ALS |
Amyotrophic Lateral Sclerosis |
| AOM |
Angle of Moment |
| APA |
American Physical Association |
| ASTM |
American Society for Testing and Materials |
| ATP |
Adenosine Triphosphate |
| ATPase |
Adenosine Triphosphatase |
| AUC |
Area Under Curve |
| Ac |
Actinium |
| Ag |
Silver (from Latin Argentum) |
| Amu |
Atomic Mass Unit |
| B.A. |
Bachelor of Arts |
| B.A.C. |
Blood Alcohol Concentration |
| BCA |
Bichlorinated Aromatic |
| BDE |
Brominated Diphenyl Ether |
| BEM |
Biomolecular Engineering |
| BMT |
Bone Marrow Transplantation |
| BODIPY |
Boron-dipyrromethene |
| BOM |
Bill of Materials |
| BPA |
Bisphenol A |
| BSA |
Bovine Serum Albumin |
| BSE |
Bovine Spongiform Encephalopathy |
| BTA |
Benzotriazole |
| BTEX |
Benzene, Toluene, Ethylbenzene, and Xylene |
| Boiling pt. |
Boiling Point |
| C-RAT |
Critical Radiator Analysis Test |
| C.A. |
Concentration of Acid |
| C.A.P. |
Common Agricultural Policy |
| C.C. |
Cubic Centimeter |
| C.F. |
Conversion Factor |
| C.F.R. |
Code of Federal Regulations |
| C.N.S. |
Central Nervous System |
| C.P.E. |
Certified Professional Engineer |
| C.S. |
Chemical Shift |
| C2H5OH |
Ethanol (chemical formula) |
| CH3OH |
Methanol (chemical formula) |
| CH4 |
Methane |
| Cl2 |
Chlorine gas |
| Cl |
Chlorine |
| D.A. |
Differential Absorption |
| D.A.R.E. |
Drug Abuse Resistance Education |
| D.B.A. |
Doctor of Business Administration |
| D.C.M. |
Dynamic Chemical Mechanism |
| D.C.S. |
Distributed Control System |
| D.H.A. |
Docosahexaenoic Acid |
| D.H.P. |
Dihydroxyphenylpropane |
| D.L.T. |
Dual Lattice Test |
| D.P.A. |
Diphenyl Acetylene |
| D.P.M. |
Disease Pathology Modelling |
| D.P.M. |
Doctor of Podiatric Medicine |
| D.R.A. |
Drug Resistance Assay |
| D.V.M. |
Doctor of Veterinary Medicine |
| DIAS |
Digital Image Analysis System |
| DTA |
Differential Thermal Analysis |
| E.A.S. |
Environmental Assessment Summary |
| E.C. |
Electromagnetic Compatibility |
| E.C.S. |
Environmental Compliance Software |
| E.C.T. |
Electrochemical Treatment |
| E.D.F. |
Environmental Defense Fund |
| E.F.A. |
Environmental Fluid Analysis |
| E.G. |
Electrochemical Gradient |
| E.H.R. |
Environmental Hazard Report |
| E.L.M. |
Electromagnetic Levitation Method |