off- - OR c
- off-air
- off-axis
- off-balance
- off-board
- off-centre
- off-centre dipole
- off-centre display
- off-centre plan-position indicator display
- off-centring
- off-channel rejection
- off-channel selectivity
- off-circuit tap changer
- off-drive member
- off-earth
- off-hook
- off-hook call
- off-hook signal
- off-line
- off-line data processing
- off-line data transmission
- off-line diagnostics
- off-line equipment
- off-line operation
- off-line printer
- off-line system
- off-line working
- off-line-reader
- off-load
- off-load voltage
- off-normal contact
- off-normal contact rest condition
- off-normal memory
- off-peak
- off-peak electric thermal storage
- off-peak load
- off-peak rate
- off-peak space heating
- off-peak tariff
- off-peak transmission
- off-premises extension station
