| Acronym | Meaning |
 | AIEMP | Ab Initio Environment Model Potential |
| AIF | Apoptosis-inducing Factor |
| AIF-1 | Allograft Inflammatory Factor-1 |
| AIGER | American Industry Government Emissions Research Consortium |
| AIH | Autoimmune Hepatitis |
| AIHA | American Industrial Hygiene Association |
| AIHA | Autoimmune Hemolytic Anemia |
| AIHC | American Industrial Health Council |
| AIIM | Association For Information And Image Management |
| AIJ | Activities Implemented Jointly [related To Greenhouse Gas Control] |
| AIM | Adiabatic Invariance Method (in Ion-mol. Reactions) |
| AIM | Adsorption Isotherm Measurement |
| AIM | Atoms In Molecules Method |
| AIMB | Analogy And Intelligence In Model Building |
| AIMD | Ab Initio Molecular Dynamics |
| AIMDSA | Ab Initio Molecular Dynamics Simulated Annealing |
| AIME | American Institute Of Mining |
| AIMP | Ab Initio Model Potential (for Valence-electron Mol. Calcns.) |
| AIN | American Institute Of Nutrition |
| AIN | Advanced Intelligent Networks |
| AIP | Aluminum Isopropoxide |
| AIP | American Institute Of Physics |
| AIP | Acute Intermittent Porphyria |
| AIP | Arc Ion Plating |
| AIPA | American Inventors Protection Act |
| AIPEA | Association Internationale Pour L'Etude Des Argiles |
| AIPHOS | Artificial Intelligence For Planning And Handling Organic Synthesis |
| AIPI | Ab Initio Perturbed Ion (calcn. Method) |
| AIPLA | American Intellectual Property Law Assocn. |
| AIPM | Analytic Independent-particle Model (in Electron-scattering) |
| AIR | Aerosol Ionic Redistribution |
| AIR CHIEF | Air ClearingHouse For Inventories And Emission Factorspar |
| AIR RISC | Air Risk Information Support Center |
| AIRDAS | Airborne Infrared Disaster Assessment System |
| AIROF | Anodic Iridium Oxide Film |
| AIRS | Atmospheric Information Retrieval System |
| AIRS | Atmospheric Infrared Sounder |
| AIS | Airborne Imaging Spectrometer |
| AIS | Acoustic Imaging System |
| AISI | American Iron And Steel Institute |
| AISIT | Automatic Intelligent Sampler For Inorganic Trace Constituents |
| AIST | Agency Of Industrial Science And Technology (Japan) |
| AIT | Autoignition Temperature(s) |
| AITP | Affinity Isotachophoresis |
| AIUPS | Angle-integrated Ultraviolet Photoelectron Spectroscopy |
| AJCC | American Joint Committee On Cancer |
| AJM | Abrasive Jet Machining |
| AKAP | A-kinase Anchoring Protein |
| AKD | Alkyl Ketene Dimer |
| AKDDQ | Aluminum Killed Deep Drawing Quality |
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