| Abbreviation | Definition |
|---|---|
| EIEIO | Enforce In-order Execution of Input/Output |
| EJ | Explicit Join |
| ELAAU | Electric Loco Assembly and Ancillary unit |
| ELI | Enormously Longword Instructions |
| ELIF | ELse IF |
| EMAC | Extended Multiply and ACcumulate |
| EMCA | Electronically Marked Cable Assembly |
| EMIF | External Memory Interface |
| EMPCA | Electro-Mechanical Power Controller Assembly |
| EMRA | East Midlands Regional Assembly |
| EMT | Emergency Medical Technician |
| EMW | Emulate Matag Washer |
| EN | Enabled Now |
| ENAS | Event Neural Assembly Simulation |
| END | End logic stream; no more instructions follow |
| ENF | Emit Noxious Fumes |
| ENTER | Enter Stack Frame |
| EOF | Error On Float |
| EOI | End Of Interrupt |
| EOI | Explode On Interrupt |