198 ESS definitions

Electronic Switching System 
Environmental Stress Screening 
Extended Service Set 
Exploitation Support System 
Enviromental Software & Services 
Earth and Space Sciences 
Energy Storage Subsystem 
Engineering Support System 
Enterprise Storage Server 
Earth System Science 
Essential 
Electronic Security System 
Electronic Switching Systems 
empty sella syndrome 
Environmental Stress Screen 
European Spallation Source 
Eastern Sociological Society 
Economics Statistics System 
Electronic Security Squadron 
Electronic Support Section 
Electronics Switching System 
ELINT Support System 
Embedded Security System 
Emergency Separation System 
Emplaced Scientific Station 
Employee Self Service 
Employment Support Services 
endoscopic sinus surgery 
Engineering Support Subsystem 
Enterprise Storage Servers 
Enterprise Systems Support 
Environmental Satellite Subpanel 
Environmental Support System 
Epworth sleepiness scale 
Equipment Support Section 
Essex 
European Standardization System 
euthyroid sick syndrome 
Event Synchronization System 
Excited skin syndrome