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automatism the condition or quality of being automatic. [2 definitions]
automatize to cause to be done automatically.
automaton a piece of machinery that resembles a human in some or all functions; robot. [2 definitions]
automobile a four-wheeled vehicle with a built-in, self-propelled motor requiring a driver and used on roads to carry people; passenger car.
automotive of or pertaining to automobiles. [2 definitions]
autonetics (used with a sing. verb) the science of the use and development of automated devices used for control and guidance.
autonomic occurring or acting involuntarily or independently; automatic. [3 definitions]
autonomic nervous system the part of the nervous system in vertebrates that controls involuntary bodily processes, such as the operation of the heart, stomach, and glands; sympathetic and parasympathetic nervous systems together.
autonomous free and independent, as a state or an organism; self-governing.
autonomy freedom and independence; self-governance. [2 definitions]
autopsy a superficial and surgical examination of a corpse, usu. to find the cause of death. [2 definitions]
autoradiograph a picture produced on a film by placing it in contact with a radioactive substance.
autosuggestion in psychology, a technique of changing one's own behavior or beliefs by repeating certain phrases or ideas to oneself.
autotoxemia see autointoxication.
autumn the season of the year between summer and winter, in the northern hemisphere continuing from the September equinox to the December solstice; fall.
autumnal pertaining to or characteristic of autumn. [2 definitions]
aux. abbreviation of "auxiliary," a person or thing that helps, assists, or supports, or a person or group that is subordinate or supplementary.
auxiliary serving to help, assist, or support. [7 definitions]
auxiliary verb a verb used usu. with participial forms of other verbs to express certain tenses, aspects, moods, and the like, such as "have" in "I have escaped" and "should" in "You should go".
auxin any of a group of organic compounds, often plant hormones, that affect plant growth.
AV abbreviation of "audio-visual," having both sound and a picture, as does film.