- overchute
- overdue
- oscillating quantity
- oscillation chain
- oscillator bank
- oscillator cavity
- oscillator crystal
- oscillatory
- oscilloscope tube
- OSI blocking
- osillogram
- out-connector
- outage
- outage probability
- outer conductor
- outgoing country
- outgoing group
- overlap
- overlapping field
- overlapping images
- overload capacity
- overloads
- overrun
- overtone
- oxygen dipole
- p region
- pacing group
- packet assembly
- packet interleaving
- padder capacitor
- page directive
- page feed
- page frame
- page protection
- paired frequencies
- pallet
- pallet segments
- output waveform
- outstation
- overall availability
- overall crosstalk
- overall fidelity
- overflow check
- overflow condition
- overflow indicator
- overflow position
- overflow type
- overhead
- overhead bits
- Overhead costs
- overhead network
- overhead pass
- overlaid cell
- overload capability
- ozone meter
- P semiconductor
- pacing
- packed decimal
- packet
- packet broadcasting
- packet port
- packet protocol
- packing
- packing density
- palette edit
- panel display
- panel system
- panoramic adaptor
- packet radio
- pad weight
- page boundary
- page fault
- paging
- paging center
- paging channel
- paging service
- paintbrush
- paired measurement
- PAL system
- PAM network
- Par value
- paraballoon
- parabolic
- parabolic antenna
- parabolic reflector
- paraboloidal reflector
- parabonic layers
- parachute cluster
- parachute dropping
- paragraph head
- parallel connection
- parallel conversion
- parallel converter
- paramagnetic amplifier
- parameter line
- parameter mode
- parameter name
- parameter passing
- parameter register
- parameter test