Latin. From whom something may be taken against his will. A definition of a debtor in a perfect obligation. In obligations merely natural, fulfillment is voluntary; a civil obligation, being ' that tie of positive law by which one bound without any foundation in equity,' although founding action, may be successfully resisted on many grounds, as, for instance, fraud; but mixed obligations, when law and equity combine, are prestable, and fulfillment may so enforced, whether the obligant is willing to fulfill or not.