Operational Evaluation Command
Office of Energy Conservation
olfactory ensheathing cell
Christophorus Flugrettungsverein
O2 equilibrium curve
O2-evolving complex
OASIS Educational Coordinator
Office of Economic Competitiveness
Office of Environmental Compliance
Olfactory ensheathing cells
Ontario Economic Council
Ontario Energy Corporation
Open Ended Company
Open Environment Corporation
operational employment concept
Operations and Engineering Contractor
Optional Expedited Certificate
Opus Embedded Commands
Ordre des Experts Comptables
Oregon Evidence Code
Organisation Entity Code
Other Exchange Company
Overseas Employment Certificate
oviduct epithelial cell
Oviduct epithelial cells
oviductal epithelial cells
oxygen equilibrium curve
oxygen equilibrium curves
oxygen-evolving complex