automatic
adjective
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operating with minimal human intervention
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resembling the unthinking functioning of a machine“an automatic `thank you'”automatonlikemachinelikerobotlikerobotic
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without volition or conscious control“the automatic shrinking of the pupils of the eye in strong light”reflexivereflex
noun
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a pistol that will keep firing until the ammunition is gone or the trigger is releasedautomatic pistol
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light machine gunautomatic riflemachine rifle