An indicator of the delivery accuracy of a weapon system, used as a factor in determining probable damage to a target. It is the radius of a circle within which half of a missile's projectiles are expected to fall.
A measure of missile accuracy. A missile's CEP is the radius of a circle around the target in which 50% of the warheads aimed at that target will land.
In the military science of ballistics, circular error probability or circular error probable (CEP) is a simple measure of a weapon system's precision. It is defined as the radius of a circle into which a missile, bomb, or projectile will land at least half the time.