- reduction rule
- reductive grammar
- redundancy
- redundancy check
- redundancy code
- redundant
- redundant character
- redundant circuit
- redundant configuration
- redundant digitals
- redundant equation
- redundant system
- reel spindle
- reentrant procedure
- reentrant routine
- reentry point
- reference block
- reference clock
- reference count
- reference data
- reference file
- reference library
- reference listing
- reference mark
- reference retrieval
- reference supply
- referential integrity
- reflecting barrier
- reflecting telescope
- reflection
- reflector voltage
- reflex copying
- reflexive space
- refresh
- refresh rate
- refutable
- regenerative divider
- regenerative track
- region fill
- register control
- registered letter
- registration services
- regression coefficient
- regression testing
- regressionfunction
- regular arc
- regular binary
- regular command
- regular commutation
- regular curve
- regular decagon
- regular dodecahedron
- regular element
- regular estimator
- regular filtration
- regular measure
- regular polyhedron
- regular representation
- regular ring
- regular space
- regular surface
- regularity
- reinforce
- reinsert
- reject character
- relate extension
- related equipment
- related item
- related term
- relation condition
- relation graph
- relational language
- relational processor
- relationship type
- relative command
- relative extremum
- relative offset
- relative pathname
- relative redundancy
- relative tension
- relay channel
- relay transaction
- release level
- release request
- relinquish
- relocatable
- relocatable code
- relocation constant
- rejection number
- relate functions
- related product
- related word
- relation
- relational
- relational condition
- relational database
- relational model
- relational spreadsheet
- relative coordinate
- relative file