Noun

• S: (n) duty, responsibility, obligation (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
• S: (n) obligation (the state of being obligated to do or pay something) "he is under an obligation to finish the job"
• S: (n) obligation, indebtedness (a personal relation in which one is indebted for a service or favor)
• S: (n) debt instrument, obligation, certificate of indebtedness (a written promise to repay a debt)
• S: (n) obligation (a legal agreement specifying a payment or action and the penalty for failure to comply)