open - over
- open
- open channel
- open jet
- open jet wind tunnel
- open loop control system
- open shell
- opening
- operating characteristic
- operating point
- operating radius
- operation
- operator
- operator equation
- operator wave function
- opposite phase
- opposite torque
- optical strain
- optimal
- optimal control
- optimality principle
- optimalization problem
- optimization
- optimization problem
- optimum
- optimum coupling
- optimum design
- optimum value
- orbit
- orbit circumference
- orbit equation
- orbit radius
- orbital angular momentum
- orbital angular momentum vector
- orbital ellipse
- orbital equation
- orbital function
- orbital moment
- orbital motion
- orbital oscillation
- orbital plane
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