Semi-automatic - ''Noun'': "Partially automatic and partially manual in operation (i.e., operated both automatically and manually, by hand); not ''fully-automatic''." This may refer to: * A semi-automatic firearm, a firearm which automatically reloads, but will only fire one round per trigger pull ** Semi-automatic rifle ** Semi-automatic pistol ** Semi-automatic shotgun * Semiautomatic switching system, a term used in telecommunication * Semi-automatic transmission: a manual transmission with an automated clutch (i.e., no physical clutch pedal), but the driver is still required to shift gears manually, by hand. Also called: ''clutchless manual transmission'' or ''automated manual transmission''. * "Semi-Automatic", a song from Twenty One Pilots' 2013 album ''Vessel'' {{disambig