noun (n)

• (physiology) responsiveness to external stimuli; the faculty of sensation(noun.cognition)

  Example:
  Sensitivity to pain.
  

  Synonym:
  sensibility, sensitiveness
  

  source: wordnet30
• the ability to respond to physical stimuli or to register small physical amounts or differences(noun.attribute)

  Example:
  A galvanometer of extreme sensitivity.
  

  Synonym:
  sensitiveness
  

  source: wordnet30
• sensitivity to emotional feelings (of self and others)(noun.feeling)

  source: wordnet30
• susceptibility to a pathogen(noun.state)

  Synonym:
  predisposition
  

  source: wordnet30
• the ability to respond to affective changes in your interpersonal environment(noun.attribute)

  Antonym:
  insensitiveness, insensitivity
  

  source: wordnet30
• The quality or state of being sensitive; -- used chiefly in science and the arts; as, the sensitivity of iodized silver.(noun)

  source: webster1913