compassionate or kindly forbearance shown toward an offender, an enemy, or other person in one's power; compassion, pity, or benevolence: Have mercy on the poor sinner.
the disposition to be compassionate or forbearing: an adversary wholly without mercy.
the discretionary power of a judge to pardon someone or to mitigate punishment, esp. to send to prison rather than invoke the death penalty.
an act of kindness, compassion, or favor: She has performed countless small mercies for her friends and neighbors.
something that gives evidence of divine favor; blessing: It was just a mercy we had our seat belts on when it happened.
entirely in the power of; subject to: They were at the mercy of their captors.