| Abbreviation | Definition |
|---|---|
| EMSA | Enterprise Messaging Security Architecture |
| ENA | European Network Architecture |
| ENAC | Environnement Naturel Architectural et Construit |
| ENSA | Enterprise Network Storage Architecture |
| ENYA | Emerging New York Architects |
| EOA | Ecosystem Oriented Architecture |
| EOA | Elmslie Osler Architect |
| EOX | Extraordinary Design |
| EPA | Effective Projected Area |
| EPA | End Point Adjustment |
| EPFC | Engineering, Procurement, Fabrication, and Construction |
| EPIC | Engineering, Procurement, Installation, and Commissioning |
| EPMA | Enterprise Performance Management Architect |
| ER | Exposed Run |
| ES | Element of Structure |
| ESA | Equal Space Area |
| ESAS | Exploration Systems Architecture Study |
| ESOA | Enterprise and Service Oriented Architecture |
| ESOA | Enterprise Service Oriented Architecture |
| ESSA | Earthfriendly and Self Sufficient Architecture |