Yes, IF it also meets the other criteria. Automatic fire alone does not an Assault rifle make.3 round burst = more than one shot with a single pull of the trigger = automatic fire capability = assault rifle.
I think this is why we're seeing "Select Fire" more often lately. I suspect the hope is select fire replaces automatic.
Sorry, incorrect use of term. 5yd penalty, loss of down...penalty declined, post again...
The term you want here is "BURST FIRE."
Burst fire IS full auto fire, just not continuous.
Select fire (aka selective fire) refers to the rifle's ability for the shooter to select the mode of fire, semi, full, or burst, at the shooter's choice.
Some variants of the M16 have semi and full auto (continuous), some have semi and burst fire. Both are select fire. Both are machineguns, under US law. Both are correctly "assault rifles"
The AR15 is semi auto only. No ablilty to select fire mode. SO, even while the AR15 meets the other requirements (magazine fed, intermediate power cartridge) because it does meet all three it is not correctly termed an "assault rifle".
News people, anti gun bigots, and the underinformed will call the AR15 an assault rifle, and believe they are correct, but they are not. It's really just that simple.