What is the meaning of obligation?

noun

• The social force that binds you to the courses of action demanded by that force."we must instill a sense of duty in our children"; "every right implies a responsibility; every opportunity, an obligation; every possession, a duty- John D. Rockefeller Jr
  • synonyms: duty, responsibility
• The state of being obligated to do or pay something.
  • usage: "he is under an obligation to finish the job"
• A personal relation in which one is indebted for a service or favor.
  • synonyms: indebtedness
• A written promise to repay a debt.
  • synonyms: debt instrument, certificate of indebtedness
• A legal agreement specifying a payment or action and the penalty for failure to comply. .