Top Definition
(adj.) The characteristic of a firearm being able to fire all rounds in its magazine with a single pull of the trigger.

Note: This characteristic is NOT indicated by the terms assault weapon or semi auto.
Fully automatic firearm types include machine guns, sub-machine guns, assault rifles, and others. Some of these may also have a semi auto mode that can be selected.

"My UZI is a fully automatic firearm, and as such was already illegal before the 1994 Assault Weapons Ban, which banned semi auto rifles."
by ed July 25, 2004

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