- a-drier
- abrasive disc
- abutment
- accelerating agent
- acceleration drag
- acceleration jet
- acceleration stop
- accelerator pedal
- accelerator pump
- accumulator valve
- abutting edge
- AC generator
- accelerating power
- acceleration distance
- access
- acid level
- acetabular bone
- Ackermann axle
- Ackermann steering
- active safety
- active suspension
- actuator
- ackerman steering
- acrylic finish
- actuating lever
- adapter plate
- adaptor
- adhesion coefficient
- adhesion railcar
- adiabatic engine
- adjustable
- adjuster cam
- adapter
- adhesion
- adhesive tape
- adjustable spanner
- adjusting screw
- adjusting sleeve
- adsorption canister
- advance
- advanced
- aero top
- aerodynamic drag
- aerodynamic mirror
- aerodynamic performance
- after-burn
- ageing
- agitation cup
- aiming
- air bag
- air horn
- air radio
- air receiver
- air suspension
- air tank
- air bellows
- air leak
- alarm horn
- alarmed
- allen key
- air purifier
- air spring
- airless spraying
- align
- alignment
- alignment change
- alkaline degreasing
- allen screw
- alloy
- alloy piston
- alloy wheel
- alternator regulator
- aluminium wheel
- aluminized
- aluminum wheels
- analogue cluster
- angle grinder
- anti-dive
- anti-freeze
- anti-lift
- anti-squat
- angle screwdriver
- annular
- arbor
- arc
- armature shaft
- articulated bus
- applicator
- aqueous solution
- armature
- asbestos-free
- assembly
- atomize
- atomizing pressure
- arcing
- armour-plated
- articulated vehicle
- asymmetric rim
- authorized dealer
- auto bonnet