- reflector stand
- refresher course
- region class
- regional allocation
- regional code
- regional processor
- regional system
- regression parameter
- regression relation
- regular map
- regular tetrahedral
- remote operation
- remote sensing
- remote sounding
- remote supervisor
- remote system
- remote transaction
- remote user
- removal expenses
- rendezvous
- renewal fund
- rental deduction
- rental subside
- repagination
- repeated signal
- repeater deck
- repeater modem
- repeater station
- repetitive signal
- repetitive sweep
- regulation rate
- reheat
- reinstatement
- reject circuit
- rejection
- relate function
- relation model
- relational calculus
- relative coding
- relativistic correction
- relativistic limit
- relaxation oscillator
- relay system
- relay transmitter
- release gear
- reliability technique
- reliability testing
- relief fund
- relocatable address
- relocation dictionary
- repair rate
- repeat indication
- repeater
- repeater chain
- repeater section
- repeater signal
- repetition coefficient
- repetition cycle
- repetition rate
- repetition time
- repetitive cycle
- repetitive printing
- replacement assignment
- replenishment
- replicated pattern
- replicator
- reply
- reporting structure
- reporting system
- representation allowance
- reproducer
- reproducing characteristics
- reproducing standards
- reproduction chain
- reproduction quality
- reproduction system
- request
- request channel
- request signal
- required parameter
- required time
- reroute
- rerouting
- research centre
- reserve account
- Reserve currency
- reserve path
- reserved volume
- reset packet
- reset-set
- resident software
- resident supervisor
- residual carrier
- residual distribution
- residual impairment
- residual sideband
- residual voltage
- residue signal
- resignation
- resistance coupling