sem·i·au·to·mat·ic or sem·i-au·to·mat·ic 
(sĕm′ē-ô′tə-mătĭk, sĕm′ī-)
(sĕm′ē-ô′tə-mătĭk, sĕm′ī-)adj.
1. Partially automatic.
2. Ejecting a shell and loading the next round of ammunition automatically, but requiring a squeeze of the trigger for each shot. Used of a firearm.
n.
A semiautomatic firearm.