| A | B |
| automobile | a self-moving vehicle |
| autopsy | seeing for oneself; an examination of a dead body to discover the cause of death |
| automat | a self-acting machine; a once-popular type of restaurant in which food was delivered to patrons from coin-operated compartments |
| automatic | operating by itself |
| automation | a system using self-operating machines |
| automaton | an apparatus that functions by itself; a robot |
| autocrat | an absolute ruler |
| autonomy | the right of self-government |
| autonomous | self-governing |
| autonomic | pertaining to the autonomic nervous system- which acts according to its own laws rather than through voluntary control regulating the heart, digestive system and other functions |