noun (n)

• the feeling that comes when something burdensome is removed or reduced(noun.feeling)

  Synonym:
  assuagement, relief
  

  source: wordnet30
• the act of reducing something unpleasant (as pain or annoyance)(noun.act)

  Synonym:
  easement, easing, relief
  

  source: wordnet30
• The act of alleviating; a lightening of weight or severity; mitigation; relief.(noun)

  source: webster1913