Semi-Automatic

Semiautomatic Pistol - Image via ATF
Semiautomatic Pistol (Image via ATF)

Semi-automatic:

A semi-automatic firearm fires, extracts, ejects and reloads once for each pull and release of the trigger. Rifles, pistols, and shotguns are all available in semi-automatic variants.

Also called Self-loading or Auto-loading.

Semiautomatic Rifle - Image via ATF