Noun
1. the social force that binds you to your obligations and 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 Jr2. the state of being obligated to do or pay something;
"he is under an obligation to finish the job"3. a personal relation in which one is indebted for a service or favor
4. a legal agreement specifying a payment or action and the penalty for failure to comply