- back coupling
- back curing
- back current
- back dating
- back digger
- back dike
- back edge
- back elevation
- back emf
- back extrusion
- back fall
- back feed
- back filler
- back filling
- back fold
- back folding
- back freight
- back gap
- back gear
- back guy
- back head
- back hoe
- back kick
- back label
- back lash
- back lining
- back link
- back magnetization
- back matter
- back nut
- back out
- back page
- back painting
- back panel
- back pass
- back pressure
- back prop
- back puppet
- back radiation
- back reaction
- back reference
- back resistance
- back rest
- back river
- back saw
- back scattering
- back scheduling
- back shop
- back slash
- back slope
- back stay
- back stop
- back strip
- back stroke
- back suction
- back surface
- back taper
- back thrust
- back timing
- back tweel
- back valve
- back view
- back wave
- back wing
- back-end
- back-fire
- back-lobe
- back-run
- back-set
- back-voltage
- backbone
- backbone chassis
- backbone network
- backbone road
- backcoating
- backcut
- backfall
- backfill
- backfill material
- backfill soil
- backfilling
- backfilling soil
- backfire
- backflash
- backflow
- backflushing
- background
- background absorption
- background art
- background color
- background data
- background document
- background image
- background information
- background ink
- background job
- background mode
- background music
- background noise
- background picture