the feeling that motivates compassion(noun.feeling)
source: wordnet30
something for which to be thankful(noun.state)
Example: It was a mercy we got out alive.
source: wordnet30
alleviation of distress; showing great kindness toward the distressed(noun.act)
Example: Distributing food and clothing to the flood victims was an act of mercy.
source: wordnet30
Forbearance to inflict harm under circumstances of provocation, when one has the power to inflict it; compassionate treatment of an offender or adversary; clemency.(noun)