What is the meaning of Assault_weapon?

Any select-fire firearm that allows semi-automatic and fully automatic operation, and is used or was once used by a military organization.

A semi-automatic firearm that resembles a military weapon.

1. A semi-automatic weapon that has a folding stock, a muzzle flash suppressor, a bayonet mount, or a pistol grip.

A semi-automatic weapon that has a folding stock, a muzzle flash suppressor, a bayonet mount, or a pistol grip.

A rocket launcher designed to attack fortified structures, such as a Mk 153 Shoulder-Launched Multipurpose Assault Weapon (aka SMAW).

Source: wiktionary.org