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Short for "semi-automatic." 1. (adj.) The characteristic, of a firearm, of being able to fire a single round for each pull of the trigger. 2. (n.) A firearm with this characteristic. Commonly mistaken to mean fully automatic, which indicates a firearm most people would call a "machine gun," with which the user pulls the trigger a single time and holds it and the entire magazine is fired in succession, usually within a few seconds.
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