n. That which is due from one person to another, whether money, goods, or services, and whether payable at present or at a future time; that which one person is bound to pay to or perform for another; what one is obliged to do or to suffer; a due; a duty; an obligation.n. The state of being under obligation to make payment, as of money or services, to another; figuratively, the state of being under obligation in general.n. An offense requiring reparation or expiation; default of duty: a trespass; a sin.