at discretion - balderdash
- autochthonal
- autocracy
- autocrat
- autocratic
- autocue
- AUTODIN AUTOmatic DIgital Network
- autogamous
- autogenesis
- autogenous
- autograph
- autographic
- autoimmune
- autoimmune disease
- autointoxication
- automanipulation
- automat
- automate
- automatic
- automatic coupling railways
- automatic fire
- automatic pilot
- automatic pistol
- automatic rifle
- automatic rifleman
- automatic stoker
- automatic telephone system
- automatic temperature regulation
- automatic train stop railways
- automatic transmitter
- automatical
- automation
- automatism
- automaton
- automobile
- automobile railway car railways
- automobile transportation
- automobile wagon
- automotive
- automotive industry
- autonomist