| Acronym | Definition |
|---|
| GCER➣Gloucestershire Centre for Environmental Records (UK) |
| GCER➣Génie du Composite Étude et Réalisation (French: Composite Engineering Study and Realization) |
| GCER➣Global Conference on Educational Robotics (annual conference) |
| GCER➣Gold Country Endurance Riders (California) |