- relational management
- relational query
- relational system
- relative addressing
- relative attenuation
- relative bandwidth
- relative coding
- relative coordinates
- relative cycle
- relative equilibrium
- relative instruction
- relative interior
- relative key
- relative maximize
- relative movement
- relative order
- relative positioning
- relative precision
- relative recursiveness
- relative response
- relative scalar
- relative topology
- relativistic particle
- relax
- relaxation
- relaxation method
- relaxation oscillator
- relay
- relay system
- release magnet
- release notes
- reliability
- reliable
- reliable communication
- reloading
- relocatable format
- relocatable module
- relocatable program
- relocatable term
- relocate
- relocation
- relocation dictionary
- relocation hardware
- relocation interrupt
- relocation register
- reorganize
- repaginate
- repeat character
- repeated limit
- repeated survey
- repeater
- repeater coil
- repeater man
- repeater section
- repeating key
- repeller
- repertoire
- repetition rate
- repetitive cycle
- repetitive instruction
- repetitive operation
- repetitive statement
- replace all
- replace mode
- replaceable
- replacement bit
- replacement text
- replicate
- replication
- reply
- report
- report clause
- report file
- report generation
- report generator
- report group
- report heading
- report layout
- report line
- report manager
- report name
- report program
- report section
- report type
- report writer
- repose period
- repositioning
- representable function
- representative
- representative domain
- representative module
- representative system
- represented
- repressure
- reprint
- reproduce
- reproducible
- reproduction
- reprogram
- reprogramming