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autonomous free and independent, as a state or an organism; self-governing.
autonomy freedom and independence; self-governance. [2 definitions]
autopilot shortened form of "automatic pilot."
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.
autosome any of an organism's chromosomes except the two involved in sex determination.
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 in conjunction with a main verb in a clause that assists the main verb in reflecting aspects, voices, moods, and tenses. In the sentence "They have escaped," the main verb is "escaped," and the auxiliary verb is "have."
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.
Av the eleventh month of the Jewish lunisolar calendar, occurring from late July through early August in the Gregorian calendar.
avail to be useful or profitable to; be of value to. [3 definitions]
availability the condition of being available.
available able to be had for use or purchase; at hand. [2 definitions]
avail oneself of to make use of to one's advantage.
avalanche the sudden rush of a large quantity of snow, ice, or rocks down a mountain. [4 definitions]