- azimuth sweep
- azimuth traverse
- azimuthality
- azote
- B-tree
- baa-lamb
- babbit
- babbit metal
- babbitting
- bable bundle
- baby press
- baby seat
- back acting
- back air
- back angle
- back azimuth
- back catch
- automatic expander
- automatic feed
- automatic graph
- automatic hunting
- automatic interrupt
- automatic message
- automatic operation
- automatic polling
- automatic reasoning
- automatic release
- automatic scan
- automatic search
- automatic signaling
- automatic starter
- automatic stop
- automatic switchboard
- automatic value
- automatic ventilation
- automatical code
- automation
- automobile
- automobile engineering
- automotive
- autoprogrammable
- autoradiography
- autoreducing tachymeter
- autotracing
- autotune
- autovibration
- auxiliary
- aware
- awl
- awning
- axial displacement
- axial fiber
- axial lead
- axial plane
- axial section
- axial strain
- axial symmetry
- axial test
- axiom schema
- axis plane
- axle
- axle-box
- axle-tree
- axometer
- axonometric
- azimuth coverage
- azimuth marker
- azimuth rate
- azimuth selsyn
- azimuthal
- bacteria
- bacteria bed
- bacteria toxin
- bactericidal flow
- bactericidal flux
- bacteriological oven
- bacterium
- bad
- bad disk
- bad fit
- bad packet
- bad sector
- bad track
- badge
- badge reader
- badger
- badger plane
- badging
- badigeon
- baffle
- baffle hole
- baffle mark
- baffle paint
- baffle painting
- baffle plate
- baffle sheet
- baffle sill
- baffle wire
- baffler
- bafflers