obligation

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

a written promise to repay a debt

the social force that binds you to the courses of action demanded by that force

“every right implies a responsibility; every opportunity, an obligation; every possession, a duty”

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

the state of being obligated to do or pay something

“he is under an obligation to finish the job”