http://dictionary.reference.com/browse/assault+rifle
assault rifle
noun
1.
a military rifle capable of both automatic and semiautomatic fire, utilizing an intermediate-power cartridge.
2.
a nonmilitary weapon modeled on the military assault rifle, usually modified to allow only semiautomatic fire.
http://en.wikipedia.org/wiki/Assault_rifle
An assault rifle is
a select-fire (either fully automatic or burst capable) rifle that uses an intermediate cartridge and a detachable magazine. It is not to be confused with assault weapons.[1] Assault rifles are the standard service rifles in most modern armies. Assault rifles are categorized in between light machine guns, which are intended more for sustained automatic fire in a light support role, and submachine guns, which fire a pistol cartridge rather than a rifle cartridge.
http://www.merriam-webster.com/dictionary/assault+rifle
Military firearm that is chambered for ammunition of reduced size or propellant charge and
has the capacity to switch between semiautomatic and fully automatic fire. Light and portable, yet able to deliver a high volume of fire with reasonable accuracy at modern combat ranges of 1,000–1,600 ft (300–500 m), assault rifles have become the standard infantry weapon of modern armies. Their ease of handling makes them ideal for mobile assault troops crowded into personnel carriers or helicopters, as well as for guerrilla fighters engaged in jungle or urban warfare. Widely used assault rifles are the U.S. M16, the Soviet Kalashnikov (the AK-47 and modernized versions), the Belgian FAL and FNC, and the German G3.
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