114 GEM definitions

Generic Electronic Module 
Geospace Environment Modeling 
Guidance Enhanced Missile 
Gateway to Educational Materials 
Gasoline Engine Management 
Giotto Extended Mission 
Graphical Environment Manager 
Guidance Enhanced Missiles 
Galileo Europa Mission 
Gemini 
General Electronics Module 
General Endeavor Management 
Generic electric module 
Generic Electronics Module 
Generic Experiment Module 
Geriatric Enhanced Modalities 
Ginkgo Evaluation of Memory 
Graphite Epoxy Motor 
Galactic Emission Mapping 
gas electron multiplier 
Gateway of Educational Materials 
Gender empowerment measure 
General Electronic Module 
Generic Equipment Model 
Genetically engineered machine 
genetically engineered microorganism 
Goddard Earth Model 
Graphic Environment Manager 
Graphics Environment Manager 
Ground Effect Machine