noun (n)

• the social force that binds you to the courses of action demanded by that force(noun.act)

  Example:
  Every right implies a responsibility; every opportunity, an obligation; every possession, a duty.
  

  Synonym:
  duty, obligation
  

  source: wordnet30
• the proper sphere or extent of your activities(noun.state)

  Synonym:
  province
  

  source: wordnet30
• a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct(noun.attribute)

  Example:
  He holds a position of great responsibility.
  

  Synonym:
  responsibleness
  Antonym:
  irresponsibility, irresponsibleness
  

  source: wordnet30
• The state of being responsible, accountable, or answerable, as for a trust, debt, or obligation.(noun)

  source: webster1913