- recursive call
- recursive function
- recursive functional
- recursive procedure
- recursive process
- recursive set
- recursively
- red X
- redeclaration
- redirection
- redox system
- reduced a
- reduced length
- reduced width
- reducibility axiom
- reducibility criterion
- reducible chain
- reducible circuits
- reducible equation
- reducible set
- reducible variety
- reduction formulas
- redundance
- redundancy bit
- redundancy checking
- redundant bit
- redundant code
- redundant digit
- redundant information
- redundant number
- redundant operation
- reenterable program
- reentrant program
- reference area
- reference code
- reference direction
- reference feedback
- reference format
- reference frequency
- reference line
- reference list
- reference manual
- reference materials
- reference noise
- reference page
- reference path
- reference period
- reference phase
- reference point
- reference set
- reflaxive space
- reflectance model
- reflection group
- reflective disc
- reflex
- reflex circuit
- reflexive relation
- reflexivity
- reflux condenser
- reformat
- reformatting
- refractory timber
- refresh cycle
- refreshable program
- refrigerating effect
- refused call
- refutable formula
- refutation
- regenerate
- regenerative reading
- regenerative repeater
- regenerator
- region
- region size
- regional network
- regional Settings
- register allocation
- register file
- register guides
- register length
- register map
- register name
- register set
- recursive type
- recycle
- recycle process
- red clay
- Redetect Tape
- redistribution
- redox potential
- reduced form
- reduced join
- reduced power
- reduced value
- reducibility
- reducible correspondence
- reducible point
- reducible polynomial
- reducible surface
- reducible system