Surety

1. The state of being sure; certainty; security.
2. Evidence; confirmation; warrant.
3. Security against loss or damage; security for payment, or for the performance of some act.
4. Hence, a substitute; a hostage.
5. That which makes sure; that which confirms; ground of confidence or security.
6. One who is bound with and for another who is primarily liable, and who is called the principal; one who engages to answer for another's appearance in court, or for his payment of a debt, or for performance of some act; a bondsman; a bail.