one- - out-
- one-address code
- one-at-a-time search
- one-byte bus
- one-day backup memory
- one-digit adder
- one-digit subtractor
- one-fold error
- one-gun color CRT
- one-hop
- one-hop route
- one-inch microphone
- one-level code
- one-line scanning
- one-pass scanner
- one-piece channel
- one-piece handset
- one-piece microphone cap
- one-pole voltage indicator
- one-port ondometer
- one-speed switching
- one-stage ondometer
- one-stop shop
- one-time tape
- one-touch buttons
- one-touch call-back
- one-touch confidential sending
- one-touch dialer
- one-touch dialing panel
- one-touch message recording
- one-touch relay sending
- one-touch speed dialing dialing
- one-track repeat
- one-way audiovisual distribution service
- one-way capacity
- one-way channel
- one-way pager
- one-way pattern
- one-way repeater
- one-way trunk
- one-way tube
