"automatic" in the noun sense

1. automatic rifle, automatic, machine rifle

light machine gun

2. automatic pistol, automatic

a pistol that will keep firing until the ammunition is gone or the trigger is released

"automatic" in the adjective sense

1. automatic

operating with minimal human intervention independent of external control

"automatic transmission"

"a budget deficit that caused automatic spending cuts"

2. automatic, automatonlike, machinelike, robotlike, robotic

resembling the unthinking functioning of a machine

"an automatic `thank you'"

"machinelike efficiency"

3. automatic, reflex, reflexive

without volition or conscious control

"the automatic shrinking of the pupils of the eye in strong light"

"a reflex knee jerk"

"sneezing is reflexive"

Source: WordNet® (An amazing lexical database of English)

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