- avalanche oscillator
- avalanche photodiode
- average life
- axial pencil
- axiomatic
- axiomatical method
- axiomatizable
- axis title
- B-spline
- babble
- babble signal
- back
- back action
- back bias
- back chaining
- back diode
- back door
- back echo
- back panel
- back resistance
- back saw
- back scattering
- back slab
- back slash
- back tab
- back track
- back tracking
- back-end
- back-plane
- back-propagation
- back-scrolling
- backbone circuit
- backbone network
- backbone ring
- backbone site
- backdate
- backdating
- background
- background activity
- background area
- background brightness
- background communication
- background display
- background image
- background job
- background operation
- background partition
- background printing
- background processing
- background program
- background queries
- background reader
- background reflectance
- background region
- background sound
- background task
- background tasks
- backing drum
- backing ring
- backing sheet
- backing strip
- backing tape
- backlit display
- BackOffice
- backplane
- backslash
- backslash character
- backslash key
- backspace
- backspace character
- backspace control
- backspace key
- backspace mechanism
- backspacing
- backtracking
- backup
- backup computer
- backup copy
- backup cycle
- backup diskette
- backup file
- backup library
- backup plan
- backup set
- backup tape
- backup version
- backup volume
- backward
- backward analysis
- backward branching
- backward chaining
- backward channel
- backward compatibility
- backward compatible
- backward derivative
- backward difference
- backward diode
- backward equation
- backward printing
- backward processing