Area of effect

area-of-effect, AOE, A.O.E., n.: the volume or space, usually a circle (on a map) or a sphere (in 3D), within which the effects of a spell, explosion, fire, or other attack or effect are felt.
Ex: "How can the Orcish Archer attack me? I hit him with a Flesh-to-Stone spell!" "No, you centered the spell on the Orc's location as of last turn. By the time the spell took effect, he'd moved out of the area-of-effect. You missed." [GJ1]