on c - orga
- one speed portable tool
- one stage configuration
- one stage missile
- one stage space transporter
- one stage to orbit vehicle
- one time strength
- one way bridge
- one way channel
- one way communication
- one way communication channel
- one way coverage pattern
- one way crossing
- one way radio communication
- one way space mission
- one way synchronous collision avoidance and ranging system
- one way system of travel
- onset time
- opacity
- opaque plasma
- opaque white ice
- open backsight
- open cast mining
- open cell foamed plastic
- open circuit
- open circuit voltage
- open cockpit
- open conduit
- open country
- open cycle engine
- open embrasure
- open ended
- open fluid power drive
- open gun mount
- open link belt
- open loop
- open loop method
- open loop operation
- open loop programming
- open loop testing
- open loop transfer function
