obligation

noun

1. 1

   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

2. 2

   a legal agreement specifying a payment or action and the penalty for failure to comply

3. 3

   a written promise to repay a debt

4. 4

   a personal relation in which one is indebted for a service or favor

5. 5

   the state of being obligated to do or pay something

   he is under an obligation to finish the job