semi-automatic

adjective

1. partly automatic.
2. (of a firearm) automatically ejecting the cartridge case of a fired shot and loading the next cartridge from the magazine but requiring a squeeze of the trigger to fire each individual shot.

noun

3. a self-loading rifle or other firearm.

adjective

1. partly automatic
2. (of a firearm) self-loading but firing only one shot at each pull of the triggerCompare automatic (def. 5)

noun

3. a semiautomatic firearm

adj.1853, from semi- + automatic (adj.). In reference to firearms, 1889.