Armor class

armor class, A.C., n., D&Dism: in D&D and derivative RPGs, a stat describing a character's ability to deflect, avoid, or absorb physical punishment without taking damage or injury. [GJ1]
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Addendum: In D&D, armor class is based on the type of armor worn by the character (chain mail, plate mail, leather jerkin, etc.). This stat is then modified by Strength, Dexterity, special abilities (such as dodging), magical properties, etc. [GJ1]