| Acronym | Definition |
|---|
| AECS | Atomic Energy Commission (Syria) |
| AECS | Associació d'Estudiants de Ciències de la Salut (Catalan Health Sciences Students Association; Catalonia, Spain) |
| AECS | Atomic Energy Central School (India) |
| AECS | Association Étudiante du Cégep de Sherbrooke (French) |
| AECS | Aeronautical Emergency Communications System (SIF) |
| AECS | Advanced Environmental Control System |
| AECS | Andalusian Education & Culture Solutions |
| AECS | Automotive Electronic Control Systems (New Zealand/Australia) |
| AECS | Advanced Entry Control System |
| AECS | Senior Chief Aviation Electrician's Mate (Naval Rating) |
| AECS | Auxiliary Emission Control Strategy |
| AECS | Average Eye Closure Speed |
| AECS | Advanced Signal Processing - Executable Common Software |
| AECS | Accenture Energy Consumer Services (energy) |
| AECS | Automated Error Control System |
| AECS | Area Environmental Compliance Specialist |
| AECS | Acquisition E3 Control Strategy |
| AECS | Automatic Eigen Calculation System |
| AECS | Asia Evangelical College and Seminary (Bangalore, India) |