noun (n)

• the state of not being susceptible(noun.state)

  Synonym:
  unsusceptibility
  Antonym:
  susceptibility, susceptibleness
  

  source: wordnet30
• (medicine) the condition in which an organism can resist disease(noun.state)

  Synonym:
  resistance
  

  source: wordnet30
• the quality of being unaffected by something(noun.attribute)

  Example:
  Immunity to criticism.
  

  source: wordnet30
• an act exempting someone(noun.act)

  Example:
  He was granted immunity from prosecution.
  

  Synonym:
  exemption, granting immunity
  

  source: wordnet30
• Freedom or exemption from any charge, duty, obligation, office, tax, imposition, penalty, or service; a particular privilege; as, the immunities of the free cities of Germany; the immunities of the clergy.(noun)

  source: webster1913
• The state of being insusceptible to poison, the contagion of disease, etc.(noun)

  source: webster1913