Encrypting File System 
Error Free Seconds 
Exchange of Futures for Swaps 
Electronic Filing System 
Error Free Second 
Encrypted File System 
Error-Free Seconds 
event free survival 
Exchange for Futures for Swaps 
Electronic Frequency Selection 
End-of-Frame Sequence 
Enhanced Full-rate Service 
Error Free Signal 
Expeditionary Fighter Squadron 
Export Finance Scheme 
Education Formula Spending 
EFAOS- Agencia De Viagens e Turismo 
ejection fractions 
elastic fibers 
elbow flexors 
elec. field stimulation 
Electric field stimulation 
electric fields 
electrical field simulation 
electrical field stimulation 
electrical field stimulations 
electrical field-stimulated 
Electric-Furnace Steel 
Electronic Filing Systems 
Electronic Firing Switch