| Acronym | Definition |
|---|
| GRETA➣GRETA Regular Expression Template Archive (Microsoft) |
| GRETA➣Generalized Resource Extraction Tool for Aggregate Data (University of Minnesota) |
| GRETA➣Ground Radar Emitter for Training Aviators |
| GRETA➣Groupement d'Etablissement Publics Locaux d'Enseignement (French: Local Public Education Institutions Group) |