oper - oval
- operable
- operate current
- operate signals
- operated signals
- operating adjustment
- operating board
- operating characteristic
- operating conditions
- operating console
- operating control
- operating current
- operating device
- operating disturbance
- operating duty
- operating engineer
- operating envelope
- operating environment
- operating factor
- operating frequency
- operating instruction
- operating maintenance
- operating manual
- operating margin
- operating overload
- operating performance
- operating point
- operating position
- operating range
- operating rate
- operating schedule
- operating signals
- operating system
- operating system boot diskette
- operating system kernel
- operating system-supplied
- operating temperature
- operating voltage
- operating wave
- operation
- operation and maintenance center
