automatic
noun(au-to-mat-ic)
a pistol that will keep firing until the ammunition is gone or the trigger is released
Synonyms: automatic pistol, 
automatic
adjective(au-to-mat-ic)
resembling the unthinking functioning of a machine
Examples:
An automatic `thank you'. 
automatic
noun(au-to-mat-ic)
light machine gun
Synonyms: automatic rifle, machine rifle, 
automatic
adjective(au-to-mat-ic)
without volition or conscious control
Examples:
The automatic shrinking of the pupils of the eye in strong light. 
automatic
adjective(au-to-mat-ic)
operating with minimal human intervention; independent of external control
Examples:
Automatic transmission. 
A budget deficit that caused automatic spending cuts.