noun (n)

• an inclination to support or be loyal to or to agree with an opinion(noun.cognition)

  Synonym:
  understanding
  

  source: wordnet30
• sharing the feelings of others (especially feelings of sorrow or anguish)(noun.feeling)

  Synonym:
  fellow feeling
  

  source: wordnet30
• a relation of affinity or harmony between people; whatever affects one correspondingly affects the other(noun.linkdef)

  Example:
  The two of them were in close sympathy.
  

  source: wordnet30
• Feeling corresponding to that which another feels; the quality of being affected by the affection of another, with feelings correspondent in kind, if not in degree; fellow- feeling.(noun)

  source: webster1913
• The reciprocal influence exercised by organs or parts on one another, as shown in the effects of a diseased condition of one part on another part or organ, as in the vomiting produced by a tumor of the brain.(noun)

  source: webster1913