Certainty. / That which makes sure; that which confirms; ground of confidence or security. / (law) A promise to pay a sum of money in the event that another person fails to fulfill an obligation.

(archaic) For certain.

plural of surety

(law) A bond issued by one party, the surety, guaranteeing that he will perform certain acts promised by another or pay a stipulated sum, up to the bond limit, in lieu of performance, should the principle fail to perform.

plural of surety bond

(law) An accessory agreement through which one binds oneself for another already bound, either in whole or in part, as for one's debt, default or miscarriage; the assumption of liability for the obligations of another.

plural of suretyship