semi-automatic

Short definition from Wiktionary

Adjective

1. 1
   Partially automatic.
2. 2
   Of a firearm that automatically ejects a shell and loads the next one, but requires the trigger to be squeezed for each shot; autoloading.

Noun

1. 1
   A semi-automatic firearm, especially such a pistol.
2. 2
   A semi-automatic transmission.