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a written promise to repay a debt
a personal relation in which one is indebted for a service or favor
the state of being obligated to do or pay something; "he is under an obligation to finish the job"
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
a legal agreement specifying a payment or action and the penalty for failure to comply