- receiving tray
- recent
- reception
- reception congestion
- recession function
- reciprocal
- reciprocal difference
- reciprocal equation
- reciprocal quotient
- recognition gate
- recognition time
- recombine
- recompile
- reconciler
- reconciliation procedure
- reconfigurable
- reconfiguration
- reconnect
- reconstitution
- record
- record area
- record block
- record circuit
- record creation
- record file
- record format
- record gap
- record head
- record length
- record lock
- record mark
- record mode
- record pointer
- record set
- record size
- record structure
- record system
- record type
- record updating
- recorded tape
- recorder scale
- recording barometer
- recording channel
- recording head
- recording item
- recording lamp
- recording medium
- recording meter
- recording track
- recover
- recoverable transaction
- recovery characteristic
- recovery function
- recovery library
- recovery procedure
- recovery system
- recovery time
- recovery volume
- rectangle rule
- rectangular parallelepiped
- rectangular plate
- rectangular wave
- rectangularity
- rectifiable
- read brush
- read protection
- read time
- read-out
- reading station
- readme
- ready
- real drive
- real filestore
- real geometry
- real point
- real table
- real translation
- realistic image
- rear engine
- reasonable
- reasoning
- reassign
- recabling
- recalculation order
- recast
- receive buffer
- receive mode
- receiver
- receiver directory
- receiver-transmitter
- receiving
- receiving device
- receiving entity
- receiving modem
- recent activity
- recession cone
- reciprocal cone
- reciprocal figure
- reciprocal relation
- reciprocal semigroup