| 40X | 40 times faster | |
| 5GE | Fifth Generation Evolution | |
| AAACE | Albanian Americans in Architecture Construction and Engineering | |
| AAAE | Asian Association for Agricultural Engineering | |
| AACE | Architecture Advanced Concepts and Engineering | |
| AACE | Art Architecture Construction and Engineering | |
| AAE | Aeronautics and Astronautics Engineering | |
| AAE | Atlantic Automotive Engineering | |
| AAE | Academy of Aerospace and Engineering | |
| AAE | Advanced Aeginian Engineering | |
| AAEE | Associate of Arts in Electrical Engineering | |
| AAEE | Arkansas Academy of Electrical Engineering | |
| AAES | Ansett Aviation Engineering Services | |
| AAES | American Association of Engineering Societies | |
| AAME | Arkansas Academy of Mechanical Engineering | |
| AAP | Apollo Applications Program | |
| AASE | Academic Association of Sales Engineering | |
| ABC | Alberta Building Code | |
| ABC | Accelerated Bridge Construction | |
| ABEB | Archives in Biomedical Engineering Biotechnology | |
| ABEG | Applied Biomedical Engineering Group | |
| ABOEP | American Board of Engineering Professionals | |
| ABSE | Agent Based Software Engineering | |
| AC | Acceptance Criteria | |
| AC-3 | Audio Codec 3 | |
