n. The rubbing of one thing against another; mutual friction: as, the abrasion of coins by attrition.n. The act of wearing away by rubbing; the state of being worn down or smoothed by friction; abrasion.n. In theology, imperfect contrition or repentance, with real detestation of sin, and a true purpose of amendment, arising from those supernatural motives of faith which are lower than charity, or the true love of God for his own infinite perfections.