| Abbreviation | Definition |
|---|---|
| EFS | Electronic Filing System |
| EFS | Electronic Forms System |
| EFS | Electronic Fund Source |
| EFSP | Electronic Filing Service Providers |
| EFT | Earliest Finished Technology |
| EFT | Electrical Fast Transient |
| EFT | Electronic File Transfer |
| EFTIR | Emission Fourier Transform Infrared Spectroscopy |
| EFTP | Electronic Federal Tax Payment |
| EFTPOS | Electronic Funds at the Point of Sale |
| EFTPOS | Electronic funds transfer at point of sale |
| EFTPS | Electronic Federal Tax Payment Service |
| EFTPS | Electronic Filing Tax Payment System |
| EFTPS | Electronic Funds Transfer Payment System |
| EFTR | Electronic Foreign Travel Request |
| EFTS | Electronic Fingerprint Transmission Specification |
| EFTS | Electronic Full Text Sources |
| EFTS | Electronic funds Transfer Service |
| EFV | Excess Flow Valve |
| EFW | Electric Field and Wave |