Electronic Throttle Control 
Electronic Toll Collection 
European Topic Centre 
Echo Tracker Classifier 
Electronic Temperature Control 
et cetera 
European Transport Carrier 
electronic timing control 
Estimate to Complete 
Estimated Time of Completion 
electronic toll collecting 
Earth Terminal Complex 
Earth Terrain Camera 
Eastern Telephone Center 
electron transport chain 
Eligible Telecommunications Carrier 
Emergency Transportation Center 
employee transportation coordinator 
Employment and Training Center 
Energy Technology Center 
Enhanced Throughput Cellular 
Environmental Technology Centre 
Environmental Technology Council 
Environmental Tectonics Corporation 
Essential Transfer Contactor 
Estimate to Completion 
Experiment Test Containers 
ATTICO 
Eagle Tree Continuation 
early total care