Ground Controlled Approach 
Graphic Communications Association 
Ground Control Approach 
Game Control Adapter 
Government Contracting Activity 
Gain-Controlled Amplifier 
Gas Conditioning Assembly 
Geophysics Corporation of America 
giant cell arteritis 
Global Coalition for Africa 
Game Controlled Area 
Gas Control Assembly 
gastric cancer 
gastric carcinoma 
gastric cardia adenocarcinoma 
gastric cardiac adenocarcinoma 
General Classroom Annex 
general combining abilities 
general combining ability 
General Communications Architecture 
General conceptual ability 
General Control Approach 
General Council Audit 
Generator Coordinate Approximation 
generator coordinate approxn. 
Geneva Convention Act 
Georgia Chess Association 
giant cell angiofibroma 
Glazing Contractors Association 
Global Cash Access Holdings, Inc.