Abbreviation Definition
OPAOpen Platform for Architecture
OPAOptimal Performance Architecture
OPBOne-Piece Building
OPBSOne-Piece Building Specifcation
OPCOrdinary Portland Cement
OPMAOpen Platform Management Architecture
OPSDOntario Provincial Standard Drawing
OPSOOverPressure ShutOff
OPSSOntario Provincial Standard Specification
OPSVOverPressure Safety Valve
OPVOver-Pressure Valve
OSOpen Space
OSAOffice of the State Architect
OSAOpen Simulation Architecture
OSAOpen Systems Architecture
OSOAOpen Service Oriented Architecture
OSROpen Side Ruled
OTOverflow Threshold
OTSOpen To Sky
OUAOffice of University Architects

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