| Acronym | Meaning |
 | AGFS | Aviation Gridded Forecast Systems |
| AGGG | Advisory Group On Greenhouse Gases |
| AGI | American Geological Institute |
| AGL | Above Ground Level |
| AGM | Atmospheric Gas Measurements Section |
| AGO | Automatic Geophysical Observatory |
| AGR | Advanced Gas-cooled Reactor |
| AGRICLIMSS | Agicultural Climate Service System |
| AGS | Alternating-gradient Synchrotron |
| AGS | Annulus Gas System |
| AGT | Above-ground Test |
| AGT | Advanced Ground Transport |
| AGU | American Geophysical Union |
| AHERA | Asbestos Hazard Emergency Response Act |
| AHF | Advanced Hadron Facility |
| AHP | Analytical Hierarchy Process |
| AHS | Automated Highway System |
| AI | Artificial Intelligence |
| AI | Action Item |
| AI | Authorized Inspector |
| AI&O | Annual Inspection And Overhaul |
| AIAA | American Institute Of Aeronautics And Astronauts |
| AIAIT | Army Intelligence And Threat Analysis Center |
| AIAS | Automatic Incident Actuation System |
| AIC | Acceptable Intake For Chronic Exposure |
| AICC | Adiabatic Isochoric Complete Combustion |
| AICE | American Institute Of Chemical Engineers |
| AICHE | American Institute Of Chemical Engineers |
| AID | Agency For International Development |
| AID | Air Inlet Damper |
| AIDA | Arecibo Initiative With Dynamics Of The Atmosphere |
| AIDA | Archive 1 Data Analyzer |
| AIDJEX | Arctic Ice Dynamics Joint Experiment |
| AIDS | Activity Information Data Systems |
| AIDS | Autoimmune Deficiency Syndrome |
| AIF | Atomic Industrial Health Forum |
| AIM | Adaptive Injection Molding |
| AIM | Advanced Industrial Materials |
| AIM | Artificial Ionization Mirror |
| AIMR | Airborne Imaging Microwave Radiometer |
| AIMS | Advanced Information Management Systems |
| AIP | American Institute Of Physics |
| AIP | Additions In Progress |
| AIP | Agreement In Principle |
| AIRAPT | International Association For Research On High Pressure Science & Technology |
| AIRES | Artificial Intelligence Research In Environmental Science |
| AIRFA | American Indian Religious Freedom Act |
| AIRMET | AIRmen METeorological Information |
| AIRS | Advanced Infared Studies |
| AIRS | Atmospheric Infrared Sounder |
Browse by Letter:
