DEFS
| Acronym | Definition |
|---|---|
| DEFS | Département d'Education et Formation Spécialisées (French: Department of Education and Specialized Training; Canada) |
| DEFS | Duke Energy Field Services |
| DEFS | Direct-Applied Exterior Finish Systems (building construction) |
| DEFS | Den Europeiske Faglige Samorganisasjon (Norwegian: The European Trade Union Confederation; EU) |
| DEFS | Deschutes Estuary Feasibility Study (Washington) |
| DEFS | Detailed Evaluation of Facial Symmetry (medical engineering) |
| DEFS | Decreasing Electric Field Stimulation |