| Noun | 1. | automatic - light machine gun assault gun, assault rifle - any of the automatic rifles or semiautomatic rifles with large magazines designed for military use automatic firearm, automatic gun, automatic weapon - a firearm that reloads itself and keeps firing until the trigger is released Browning automatic rifle, BAR - a portable .30 caliber automatic rifle operated by gas pressure and fed by cartridges from a magazine; used by United States troops in World War I and in World War II and in the Korean War machine gun - a rapidly firing automatic gun (often mounted) |
| 2. | automatic - a pistol that will keep firing until the ammunition is gone or the trigger is releasedautomatic firearm, automatic gun, automatic weapon - a firearm that reloads itself and keeps firing until the trigger is released | |
| Adj. | 1. | automatic - operating with minimal human intervention; independent of external control; "automatic transmission"; "a budget deficit that caused automatic spending cuts"mechanical - using (or as if using) mechanisms or tools or devices; "a mechanical process"; "his smile was very mechanical"; "a mechanical toy" manual - requiring human effort; "a manual transmission" |
| 2. | automatic - resembling the unthinking functioning of a machine; "an automatic `thank you'"; "machinelike efficiency" mechanical - using (or as if using) mechanisms or tools or devices; "a mechanical process"; "his smile was very mechanical"; "a mechanical toy" | |
| 3. | automatic - without volition or conscious control; "the automatic shrinking of the pupils of the eye in strong light"; "a reflex knee jerk"; "sneezing is reflexive"physiology - the branch of the biological sciences dealing with the functioning of organisms involuntary - controlled by the autonomic nervous system; without conscious control; "involuntary muscles"; "gave an involuntary start" |